And you don’t need an account on YouTube to watch content there. NewPipe works just fine for me without an account, so not only do I not get ads, I also get no tracking and still get the content I want.
Changing my email on the dozens of services I use is a giant pain in the butt. I’m planning to ditch my Gmail account, but it’ll involve a transition period where I set up a bunch of forwards so I don’t miss stuff.
The most difficult one for me is Google Docs because I use a lot of Google-specific spreadsheet stuff, like Tiller integration (I don’t use Excel) and stock price lookups.
So other than Google Sheets and Gmail, I honestly don’t use my Google account for anything important.