I myself only use DBM, WeakAuras, Healbot, Omen, and TomTom regularly, although I have used many others over the years. These above are all I need for the content I want to do. I’ve always just updated them manually, TBH I never knew there was another way to do it.
I’ve said before that I dislike the concept of addons in general although I wouldn’t criticize players for using whichever ones they prefer. I think it’s poor design to basically make some addons, particularly DBM and WeakAuras, almost mandatory for raiding, but at this point they’re here to stay.