Keith, the Winnie the Pooh at WDW is better than the one at DL, not sure what it's like at Paris (wasn't there when I was there) or HK since I haven't been. It's nowhere near as good as Tokyo though
The Magic of Disney Animation use to be a LOT better at WDW until they shut the animation studio down
The ones I've missed are....
MK: Mickey's Philharmagic, Stitch's Great Escape and Monsters Inc Laugh Floor, but that's because they're all new since I was last there.
I never got to ride anything that was gone before 1997.
Epcot: I've only ever been to the Mexico, Norway and Canada attractions in World Showcase, never seen the others. I also haven't been on Nemo and Mission: Space since they're new (to me). Would like to see the old Journey with Figment back and Horizons because I either didn't ride them or can't remember them from my first trip.
Studios: This is probably the big one that I've actually missed rather than it just not being open - Fantasmic! We were meant to have a dinner package last time I went to WDW, but the weather had other ideas. Never leave a 'must do' til your last night!!!! The newies here are Toy Story Mania and Lights Motors Action, but I've seen that in Paris. As for the set walk-throughs, I have no interest.
AK: Never been interested in the Conservation Station so haven't been on the train to that. The Finding Nemo musical is new as is Expedition Everest, so they're both on my list for next time. One thing I didn't get to try but wish they still had are those boats that went around the river. I know they didn't last long, but I reckon they would have been a nice, relaxing ride.
I've mostly been on everything I can. I'm a bit fanatical about it actually. Craig is worse (but he has only been to DL and TDL). He marks off attractions on a park map, just to make sure we don't miss anything!!!!