In complete seriousness:

You should be take pride in doing something like that, even if the people using those apps never knows your name, you've still influenced their life in some small and not necessarily meaningless way; if the changes you made makes it in some way more enjoyable or just plain easier to use, then you've done a good thing.

Of course, I've always been the sort to wonder at things like "who actually typed the text for these error messages in the original Windows OS?" and such inane stuff. I even got a kick out of watching World Series of Poker a few years back and one of the players they talked to claimed to be the guy who came up with and programmed in that squiggle red line that appears under misspelled words when you type. And, I almost always watch credits through, just absorbing the names of as many people as I can (barely any really :-( ). Hmmm... thinking of that, I've probably seen DomA's real name on screen and not known it, doesn't he do VFX or such?

So yeah, totally cool IMO what you do.