Argthtjtr

I don't think you'll have any issues with any of these replies in normal conversation, so I wouldn't let it concern you. There is a relatively new study that claims people who say things such as "no problem" in reply to "thank you," are essentially saying that the thanker's issue was somehow beneath the responder, but I doubt if anyone actually feels like that. It's all a big to-do about nothing, really.

If someone thanks you, just be sincere about it--show that you appreciate their acknowledgement of whatever it is that you have done for them in whatever fashion you find comfortable. Heck, use Spanish; say, "de nada."

How native English speakers tend to
respond to "Thank you!" now? What I
should care about, when choosing from
the available options?

In a shop, if the assistant says "thank you", I usually say "thank you" back to them. Another thing is that quite a lot of the time it isn't necessary to reply to "thank you" with any particular "response" phrase. For example in a dialogue like this:

A: Here's your key.

B: Thank you.

A: See you next week.

there isn't really any need to say any set phrase after the "thank you". I think in normal English discourse we often don't reply to "thank you" in any special way. (I don't have any statistics about this, but that is my strong impression.)

"You're welcome" was taught to me in school (NW America) as polite, but "no problem" and "don't mention it" are common between friends. My tech support guy always texts " np" after I thank him for fixing my computer at work. It seems self-effacing and generous to me.

When I first started travelling on business to the US (from Canada), I felt a little miffed that my "Thankyou"s were not being acknowledged. Not with "you're welcome", not with "happy to" or "no trouble at all" or even "no problem". Never mind a "thank YOU" response. Then I noticed that, almost all the time, there was a little "uh-huh". At first that irritated me more, and then I developed a mental translation between "uh-huh" and "you're welcome" and my business trips became less stressful.

I don't think anyone will find you odd if you say "you're welcome" to each thankyou. Don't draw any conclusions about people (their mood, whether they are polite, whether they were raised well, their opinion of your gratitude for their act) by what they say to your thankyous. It varies wildly.

The best option is still "you're welcome", and Wiktionary defines it as:

1907 (as reply to “thank you”).

If you're not satisfied, there is the alternative of "My pleasure", which is my personal favourite.

The only one that is fairly standard is "You're welcome" the others, in my opinion, are just variants of the same sentiment. That is, it is customary to demur somewhat and make it as if the thing you are being thanked for wasn't worthy of the thanks. It's weird, but who knows where these things get started?

Some other straightforward, professional (possibly terse) options not already mentioned:

Certainly.

Or,

Of course.

Or, already mentioned in longer form, but sometimes shortened to this:

Happy to.

I think that all of these might be more likely to be spoken than written, however.

No worries is very common in Australia.

My most common response are "Certainly" and "My pleasure" but I sometimes use the less formal "De nada" (I grew up in an area with strong Hispanic roots...), "Sure", "No problem" and of course "You're welcome".

Those you suggest are not in my production vocabulary, but I would find them perfectly acceptable.

This depends on your professional setting, but to keep reasonably friendly, often I will simply reply:

No worries.

Or,

Any time.

Or, both:

No worries. Any time.

"You're welcome" is the only correct response to "Thank you" in American English as far as I'm concerned. It grates on my nerves to have someone respond to me using "no problem".

I was born in Britain the middle of the last century and learned to say. "Don't mention it." The American response "You're welcome" is now common in Britain and I sometimes use it. Since some acknowledgment seems appropriate I often say "OK". I have heard, "You bet" only from Americans however.

You're welcome!

or

Not a problem!

These are probably your most common and casual replies.

I have read that many in the UK find "You're welcome" grating, preferring the "Not at all" kind of response. I find "No problem" annoying, for reasons I can't quite verbalize.

You can use

You're welcome.

or

It was my pleasure.

or

It was nothing. I was happy to help.

There are others, but these will suffice.

You would do same for me.

Lesson taught by Guy Kawasaki.

A lot of times in casual conversations, I've seen people, simply nod or smile in response to a 'Thank You'. I think that's also acceptable.

I was born in Britain in 1960 and grew up hearing "You're welcome", "Not at all", "Don't mention it" and "My pleasure". I certainly didn't think of "You're welcome" as an Americanism, rather as the most standard response to "Thank you".

I have lived abroad since the early 1990s and, on a trip back to the UK last month (2018), I was struck by all the shop assistants responding to "Thank you" with "No problem" or "No worries". I was taken aback, since I hadn't expected them (or me) to be worrying about anything. Presumably it has become standard in British English over the past decade and no longer sounds offhand (as it does to me). The compensation is that in Britain the shopkeepers still call their customers "Darling", "Love", "Pet", or other terms of endearment, so I get a warm feeling that way instead.