1. Horizons. The future-set equivalent of PotC or HM - with the perfect combination of sets, screens, music, narration. Probably my all time number 1 - a singular work of art that should have been landmarked.
2. World of Motion. Same as above.
3. Great Movie Ride v.1. As much as I disliked the TMC version the ride ended on, it's criminal that all those detailed sets and AAs are giving way to a tv-stick animation screen ride. I'm fairly certain I'll value just one GMR show scene - Gangster, Western, Alien, Indy, etc. more than the entirety of Mickey's Magic Express.
4. The Living Seas. The entire original experience beginning with the outdoor water feature and background music - through pre-shows and hydrolators to the ride and Sea Base - and Hydrolators to return to "surface", completing the experience - ranks as one of my all time favorite things to do at a theme park.
5. Maelstrom. The best ride (almost no competition) and 2nd best attraction in World Showcase. Every country should have a D-ticket family ride like Maelstrom that explores the culture and has a bit of a kicker.
6. Mr. Toad's Wild Ride. My favorite of all the Fantasyland darkrides.
7. Dreamflight - Original, Future World-Lite experience in Tomorrrowland.
8. Journey into Imagination & Captain Eo. The former because it was another Original Future World classic - created by and for a more sophisticated people. The latter for pure nostalgia.
9. Original Disney-MGM Backstage Tour. When the park opened, it was fresh, exciting and went on forever (both the tram and walking tour were combined).
10. Monster Sound Show. Funny and fast-paced.
I'll stop at ten.