I'm on the family plan, and it's certainly expensive compared to other streaming services. But I use YouTube both personally and professionally. I teach, and whenever I need to show a video, having a work account with premium is invaluable since I can't install ad blockers on campus. My wife and kids all have their own accounts under the family plan as well. We all use YouTube music as well.
Google pisses me off and I've been getting out from under their heel for a while, but YouTube premium is something that I genuinely find value in paying for. At the very least, I want to financially support the creators that I watch and this is the best way to do so while avoiding advertisements.
That's more of an exception than the rule.