It’s always fun to quantify this. I can say that for certain I avoid the tourist things in my home city and my current adopted home city. I cannot remember the last time i was near them, actually.
But why? Tourist sights are tourist sites for a reason. The Tower of London is swarming with tourist, but its still genuinely fascinating. If only for Henry VIII's armoured codpiece.
In my native city: Times Square is to be avoided at all costs; the Met is worth going to.