Disneyland's Adventureland (Tiki Room, Jungle Cruise, Indiana Jones and the Temple of the Forbidden Eye... and Dole Whip!)
Can I say "All of World Showcase"? If I have to do it on a country-by-country basis, probably Japan sticks out the most (odd, because it doesn't have a ride, but I love the store and the Teppan dining room... plus it was always a great spot to watch IllumiNations from)
I'd also want to say "All of Future World", actually; particularly fond memories of sitting at the Fountainview Cafe and watching the performing water. If I have to do that on a pavilion-by-pavilion basis, I think I'd single out Journey Into Imagination during that sweet spot around 1997 where it had the original version of the ride, the original incarnation of ImageWorks and Honey I Shrunk The Audience, plus the gloriously fun and silly fountains and topiary around the front, and Wonders of Life when it had Body Wars, Cranium Command and a whole bunch of little themed things to play with.
One other I'd like to single out is Animal Kingdom's Africa. Tusker House is an okay restaurant for breakfast, and Kilimanjaro Safaris has always been a ride I've got a lot of fondness for.
And one really really leftfield suggestion:
The bottom floor of DisneyQuest (That funky Crystal Maze-esque game with driving RC trucks with live video feeds around a maze; the Virtual Jungle Cruise game (that I always thought the idea would work really nicely in a home format using Wii MotionPlus!) and the Pirates of the Carribean game that used CAVE technology)