My favorites:
Mk- Splash, HM, Buzz
Ep- Test track, world showcase (no other must dos for me)
HS- Rockin roller coaster (favorite in all of WDW), Tower of Terror, Star Tours (wish they still were doing the Star Wars fireworks like they were last year)
AK- Everest, Safari (not one of our favorite parks, but keep saying we're going to try to spend more time next time)
My nephews favorites when he was 6 & 8 and wasn't into much thrill/coasters (going next year when he'll be 10 and think he'll be into more thrill then)
MK- Dumbo, Alladin, Speedway
HS- Star tours, Toy story
EP- TT, Nemo
AK- Safari, said he liked Dinosaur but didn't care to go back on either