MK will realllly disappoint you in most areas, but the Haunted Mansion is superior at least.
Okay, you should know right now I'm a very unconventional teen when it comes to favorite parks and rides. My favorite park, because of theme, is Disney's Animal Kingdom, it is so intricately done.
Fave rides:
MK: Haunted Mansion (longer and better updated than DL), TTA (Like the old PeopleMover), Jungle Cruise (different, and I like it better than DLs), Swiss Family Treehouse, Hall of Presidents. The only better ride in FL is Mickey's Philarmagic, because DL doesn't have it. The rest can't touch DL's versions (except maybe IASW without characters and Snow White with a real ending). IASW doesn't have an elaborate, beautiful facade, it's under a tent... indoors... but still- no characters!
Epcot: Soarin', but because of DCA, you could skip it; Spaceship Earth (LOVE IT!... the Golf Ball if you're wondering

), Others will suggest you ride Mission:Space and Test Track, but I'm not fond of either, though they are Future World staples. DO NOT MISS: The World Showcase... beautiful country representatives, yummy food (it's food and wine festival time at EPCOT) DON'T MISS: The American Adventure, and the other movies in the country pavillions
Hollywood Studios: Toy Story Mania (better queue than DCA), Tower of Terror (waaayy better than DCA's, random drop sequence, etc), Rockin' Roller Coaster, and check out the Animation Academy (though DCA's is FAR superior). That's all I can recommend other than the Great Movie Ride.
Animal Kingdom: Kilimanjaro Safari = amazing, Expedition Everest is a DO NOT MISS (Hopefully you'll see Ms. Betty the Yeti, but she's a bit broken now adays), Dinosaur's okay, you can skip all of Dinoland USA, see It's Tough to Be a Bug, just 'cause it's inside the Tree Of Life, See Festival of the Lion King, and see Finding Nemo: The Musical... Take time to enjoy this park and soak in the atmosphere.
Well.. HIH!