When you do it it's "tourism" when I do it it's "travelling". When you're visiting a place for a shorter period of time primarily for leisure, you're a tourist. Sure you can tourist in more or less intrusive ways, but just accept the label and move on.
the Ramones could no longer rent an apartment in Brooklyn. Struggling painters could most certainly not afford to live in Paris these days...
None of which has anything to do with tourism.
On the contrary. Tourism is a major driving force behind the large scale conversion of long term rentals into hotels via Airbnb.
Dictionary definition of a tourist: "One who travels for pleasure.".
Which part do you oppose the most? The queuing, the photo taking, or the finding of the changing of the guards an amusing spectacle worth seeing once in your life. If there's no queue and I don't take any pictures, is it still "touristy"?
The bottom line is that most "touristy" stuff became touristy because it was a kind of cool/unique/fun/interesting thing to see/do. I agree that if there's a long queue you have to balance how much time you want to spend against the value of the thing you'll see.
The one where you lift property prices so high that nobody can live in the city centres anymore.
This local goes the same places the tourists do because the UK is beautiful and the foreign tourists I meet have good taste ;)