I use ad blockers and open source privacy focused software whenever I can but occasionally I have to use computers that don't belong to me or an older phone where my usual applications aren't installed and seeing all the advertisements just feels dirty and dystopian.
I think the worst ads are the text to speech ones that say "Download this app today". The unblinking energenic people saying you can make a living at home are probably a close second.
Every once in a while I find myself looking at the Internet without ad blockers. Like, newly-installing a browser on a newly-installed OS, or trialing a new browser on my phone or whatnot. And when it happens it’s a massive shock to me just how unusable the modern Internet is without an ad blocker.
If I were forced somehow to not use an ad blocker, I would probably stop using the WWW portion of the Internet and likely grossly cut down on other facets of the Internet.