Magic Kingdom:
~The Hall of Presidents
If you like 'Great Moments with Mr. Lincoln' imagine it with 42x the chief-executives!
~Jungle Cruise (it's about 3 minutes longer than the one in CA, and it includes show scenes not found at the original).
~Buzz Lightyear's Space Ranger Spin.
~Haunted Mansion (less different, but it's worth taking a look to compare).
~Mickey's PhilharMagic (currently the only 3-D presentation unique to WDW).
~The Country Bear Jamboree (The original show -hasn't been seen in California since 1986)
All the other attractions are fairly similar to their California Cousins (as far as location and story) you'll definitely want to check them out and note the differences yourself.
Epcot:
~Test Track
~Mission:Space (if you're prone to motion sickness you may want to save this one for last... or maybe even skip it. Otherwise, it's completely AMAZING!)
~Universe of Energy (you will recognize some of the Dinosaurs from the Primeval World diorama, but the rest of this 45 minute traveling theater experience is unique to WDW.)
~Living with the Land
Some find this boat ride tour of a working agricultural laboratory a bit boring, but it has a certain charm, and can be quite interesting for the horticulturally-minded. (If you enjoy the ride, you may want to get a closer look at the greenhouses by taking the "Behind the Seeds" tour, which is 1 hour long and costs a small fee.
~Journey into Imagination with Figment
While nowhere near as extravagant as the original Imagination attraction, this cute journey through the Imagination Institute's Sensory Labs is worth checking out. The line is never very long, and at the exit, don't miss Image Works.)
~The American Adventure
The history of the United States in 25 minutes or less. Again, great for fans of Mr. Lincoln and HoP.
~Maelstrom
If the line's too long, grab a FastPass for this mini-flume adventure aboard a viking boat.
Disney/MGM Studios:
~Indiana Jones Epic Stunt Spectacular
Great live stunt show -it's no thrill ride, but it is thrilling.
~Tower of Terror 4
Hooray Hooray Hooray. Ride it, Live it, Love it!
~Rock n' Rollercoaster
Rock with Aerosmith.
~The Great Movie Ride
Large-scale Dark Ride+ Spieling tour guide + Great movies + a few surprises= A Spectacular Journey
Into the Movies!
(ask if Erin is working, ride her vehicle)
~Walt Disney: One Man's Dream
Everything that "The Walt Disney Story" was and much much more!
Disney's Animal Kingdom:
~Festival of the Lion King
The BEST show on WDW Property!
~Kilamonjaro Safaris
Get there early, or right after a rainstorm. *The animal habitats you'll explore in your safari vehicle take up more acres than
Disneyland or WDW's Magic Kingdom!
~Pangani Forest Exploration Trail and Maharaja Jungle Trek
These wonderful nature walks each have their own free-flight aviaries. See exotic animals and birds up-close!
~Flights of Wonder
See birds from all over the world exhibit their natural behaviors.
~Dinosaur
It's Fast! It's a Blast! It's in the Past!.... and it's dark.... yeah, that pretty much sums it up.
There are lots of other things to see and do. Everyone has their own list, and you'll certainly make your own.
Don't forget to check out DisneyQuest, one of the water parks, and some of the resorts if you've got the time.
Don't try to do it all, though... Remember you're on vacation!