I agree it does depend on who is with you. My kids are teenagers and don't like most of the parades. They do like the one in Hollywood Studios.
Our favorites by each park are
Magic Kingdom - philairmagic, splash mountain, tea cups, jungle cruise, monsters inc laugh floor, peters pan flight, aladdin carpets(like dumbo but not nearly as long of line)
Epcot (Soarin, Test Track, Turtle talk with Crush, living with the land, Honey I shrunk the audience, spaceship earth
Hollywood Studios - Toy Story Mania, Tower of Terror, Muppets 3-D, Rock and Roller Coaster, great movie ride, Beauty & the Beast, Fantasmic, Block Party Bash
Animal Kingdom - Safari, Flights of Wonder, Festival of Lion King, Kali river Rapids, Nemo the musical, expedition everest, its tought to be a bug
Places to eat - Le Cellier, Ohanas, crystal palace, 50's Prime Time, Sunshine Seasons and pizzafari