Since No one is actually giving a list. I 'll throw in my must do’s (Depending on height, age and capabilities of course). These are thinks that are not to be missed at WDW
MK: Pirates, Haunted Mansion, Small World, Space and Splash Mountains, CoP, the railroad
Epcot: Spaceship Earth, Soarin, Test Track, American Adventure, the Mexican Pyramid
Hollywood: Great Movie, Indiana Jones, Tower, Rock n Roll, Muppets 3d
AK: Kilimanjaro, Lion King Festival, Everest, Tough to be a bug, Nemo
Also the Boardwalk, The Grand Floridian Lobby and Fort Wilderness.
These are things I would make sure a first timer sees, along with plenty of the little details.