I wonder what impact they have on people's mental health.
A couple reasons:
Back when I did use them, I got really bothered by sites breaking, and I'd rather have the ads than dealing with "is this broken because of my ad blocker or is the site broken". Now, I've just gotten to the point where I don't really mind.
The other part is there's enough content I consume that is supported by ads that I would like to continue supporting, without having to consciously opt into it (e.g. news sites; I don't want to pay a subscription for every newspaper but am happy to contribute to what little money they get from ads)
The difference in experience is striking. Random auto-playing videos that are stuck in the corner of your browser. Horizontally it takes up like half of my screen. It has an X button that either doesn't work, OR its hit box is just so tiny that you have to tap it multiple times to get it to actually close. Not to mention cookie banners that take up 20% of my vertical real estate.
Maybe you can get used to that shitty experience, but I certainly can't. I almost always just immediately open Google News articles in Firefox now.
And it even affects people that should be adapt at math too.