My favorites are Peter Pan, Haunted Mansion, Tower of Terror (no interactive elements, just for the atmosphere), Star Tours, Expedition Everest, Little Mermaid.
Queues with interactive elements:
7 Dwarfs Mine Train - gem sorting game, colored fountain, barrels that you can spin to make a projection
Journey of the Little Mermaid - scavenger hunt with the crab who pops up - I've never done it as the line was never long enough to stop
Peter Pan's Flight - New queue takes you through the Darling's nursery where you can interact with Tink and bells and such
Haunted Mansion - musical crypts and such outside the entrance
Big Thunder Mountain Railroad - TNT plungers and viewers that show down in the mine - these don't really seem to work/do much
Space Mountain - just some space games along the latter half of the Star Tunnel
Soarin' - weird game where the whole group of people in line lean their bodies to control a bird - very difficult!
Toy Story Mania! - Mister Potatohead can talk with guests and recognize them and such - I hear he's on hiatus right now due to expansion.
That's all I can think of, but I probably missed a few.