I don't know if I'm "done with Disney just" yet, but I don't have much interest in anything besides The Magic Kingdom and Typhoon Lagoon for the reasons the OP has mentioned. The 3 other parks, besides not being worth the price/trouble for what they currently offer, won't really offer all that much that interests me personally once they are finished. The only thing I was really looking forward to for this years D23 was the new theater coming to Main Street, which now sounds like it's been canceled, but with the theater I was hoping there would be some type of expansion on Main Street, one of the original elements of the parks, and hopefully some return to the "small town" charm of the original Main Street instead of the "giant gift shop" it now is
All these other up coming "additions" are really "alterations" meaning that... while some people many not like that Snow White's Scary Adventure was replaced with a Princess Meet and Greet, but at least they didn't re-theme that section of Fantasyland to Star Wars or Guardians of the Galaxy, or to something that doesn't "feel" like it belongs in the Storybook world of Fantsayland, but that's what they're doing in the other parks, and rumored to be doing more of. The Studios has always had an Indiana Jones area, and Animal Kingdom has always had a Dinosaur area, both of which could use some "improving" but "replacing" Dino-land with and Indiana Jones-land sounds insane to me.
I have no problem with them adding new things to parks, but no effort or thought seems be given to how these "new things" alter the identity of these "classic parks", and the new things aren't being added for any kind of artistic or thematic reasons, they're are only being added to capitalize on the current popularity of these current movie franchises. If in 20 years, these "new things" stop being popular, it'll just be an assortment of mismatched "old junk", which will simply be replaced with some other new thing, and if they aren't building things that stand the test of time, the parks will no longer be classics