Around here, I've noticed that "Thank you" is losing ground to " 'preciate it". "I appreciate it/you're welcome" don't really seem like they go together, so you kind of have to come up with something other than "you're welcome".
I don't use "my pleasure" because 1) I try not to lie and 2) it reminds me too much of the bots that run Chick-Fil-A.
I never really got the huge aversion to "no problem" some people seem to have. I think it's mostly in the minds of stodgy, tie-wearing fucks that don't actually do any work and don't understand that literally nobody under the age of thirty (hell, could be thirty-five or forty at this point) is going to find it objectionable. We had a training class where the instructor was like "And obviously, you don't say 'no problem'" and nodded along without going into any more detail while the millennials in the class exchanged puzzled glances, as if we had been told not to use the word "portcullis" or "Cincinnati".