Well, I'm afraid that I don't really remember most of these. The Empress Lilly is about it out of that list (attending a character breakfast there on my third birthday is my first memory, period). Oh, and I did use WorldKey at Epcot once. However, here are a few others:
"Here Come the Muppets" live action show at Disney-MGM Studios (pre-dated MuppetVision)
The Dog Cafe from the Rocketeer on the Backlot Tour
The short-lived ABC Sound Studio, which was around between the Monster Sound Show and Sounds Dangerous
The Mike Fink Keelboats
And, of course, the long lost powder soap.
I also have very vague memories of a videoconferencing demonstration of some sort in CommuniCore. It wasn't WorldKey, it was something else entirely. I just remember talking with someone, and at one point he flashed a picture of Cleveland (my hometown) on the screen. Can anyone shed some light on this?