To get you in the mood for Magic Kingdom -
-Watch some Mickey Mouse shorts, the old ones, the new ones, whatever... can be found on YouTube.
-Cinderella (Castle)
-Peter Pan, Pinnochio, Beauty & the Beast, The Little Mermaid, Alice in Wonderland, The Many Adventures of Winnie the Pooh, Dumbo, The Goofy Movie, Sleeping Beauty, Tangled, Brave (FantasyLand)
-Lilo & Stitch, Toy Story, Monsters Inc. (Tommorowland)
-Swiss Family Robinson, Alladin, Pirates of the Carribean movies (AdventureLand)
-Song of the South animated scenes (YouTube), Toy Story 2 (FrontierLand)
-Haunted Mansion, Princess & The Frog (Liberty Square)
-Lady & The Tramp (Town Square, especially if you plan on eating at Tony's Town Square)
Animal Kingdom
-Pocohantas, Jungle Book, It's a Bug's Life, Dinosaur, Finding Nemo, The Lion King, Tarzan
Epcot
-Mulan, Three Caballeros, Frozen (out in a couple of weeks), Snow White, Mary Poppins, Alice in Wonderland, Beauty & the Beast, Ratattouille, Alladin, Finding Nemo
Hollywood Studios
-Star Wars/Indy Jones (not Disney at the time, but are now), The Muppets, Cars, Toy Story (1, 2, & 3), Pirates of the Carribean, The Little Mermaid, Wreck-It Ralph, Beauty & the Beast, The Love Bug (if Backlot Tour is still open), Fantasia, watch the Disney Jr. shows
Others not mentioned above -
Bambi, The Sword in the Stone, 101 Dalmations, The Incredibles, Up, Enchanted, Bolt, The Scorceror's Apprentice, Oz the Great and Powerful, Monsters University, Planes
Christmastime - Muppets Christmas Carol, The Santa Clause trilogy, Mickeys Christmas Carol
Halloweeen - Hocus Pocus, Nightmare Before Christmas