My 2.5 year old's faves at Christmas...............
MK: Dumbo, Carousel, Peter Pan, Pooh (slightly scared of the heffalumps and woozles part adn the thunder part), playground under Splash Mountain, Aladdin's Magic Carpets (he giggled at the camels spitting), Pirates of the Caribbean, Jungle Cruise, Buzz Lightyear (one of the biggest faves along with Peter Pan), Speedway (always so crowded), and all of Toontown. Peter Pan, Pooh, Pirates and Buzz are all dark rides. Small World was closed. Tom Sawyer's Island and Swiss Family Treehouse are geared towards bigger kids. Haunted Mansion scared him, and he was too small for most others not listed.
Epcot: Mexico and Norway's boats, Circle of Life show, Spaceship Earth, Carousel of Progress, all of the LIving Seas, Journey into Imagination with Figment. Dark parts: spaceship earth, some of living seas (but you've got to take them to turtle talk with Crush, he just loved it), both boat rides, and beginning of and parts in Carousel of Progress and Circle of Life, parts of Journey.
AK: boneyard and dino statues in the little trail on the way to Dinosaur (but definitely not Dinosaur it's very scary), Triceratop Spin, Safari, all animal trails. We didn't go to conservation station or Kali Rapids.......too wet to be comfy in December. It's Tough to be a bug scared him silly, and we had to leave midway through. His favorite park.
MGM: Little Mermaid........some scary parts though, and does get dark. Playhouse Disney, but he cried about not getting to go hug bear.........he couldn't understand that he could hug all the other characters he saw but not this one, and if you don't sit in the right spaces, the bubbles and confetti don't come near you.......really sets off the jealousy monster.........He liked the Star Wars area, but wasn't big enough for the ride. He liked Fantasmic when he got to sit on daddy's lap and pretend to pow the bad guys for Mickey, but it is scary. Honey I Shrunk Kids Playground is very cute and great photo ops, but easy to lose them for a moment or two.....not sure I'd try it with two little ones, maybe station one parent near the exit so they can't get out without you knowing. He's scared to death of the Muppets, and they blow a cannon in there, so we had to leave it. He loved the Osborne Lights that were there when we were, and the snow falling. All in all, though, this was the worst park for him, although it's one of our family's faves.