Funny you should ask this. We were just in Busch Gardens VA with our DDs and I commented HS much I prefer Disney rides because many of them are non-traditional amusement park rides, meaning that don't all spin you until you are dizzy.
My faves:
MK: Peter Pan (calm, dark ride), Winnie the Pooh (calm, dark ride) Mickey's Philharmagic (3D show), jungle Cruise (tranquil boat ride), Monsters Inc. Laugh Floor (funny show), Carousel of Progress (show), and Tomorrowland Transit Authority (tranquil ride).
Epcot: The Sea with Nemo (tranquil ride and exhibits), Turtle Talk with Crush (cute show), Soarin (amazing ride), Gran Fiesta tour in Mexico (fun, tranquil boat ride), America Adventure (fantastic show), movie in France, street shows in Italy and UK, and the British Revolution show in UK.
HS: Beauty and the Beast show, Voyage of the Little Mermaid (show), Walt Disney One Man's Dream (walk-through exhibit), Muppet Vision 3D (movie), the Great Movie Ride (tranquil ride), and Indian Jones Stunt Spectacular(show).
AK: Safari, Festival of the Lion King (show), and Finding Nemo: the Musical (show).
Any of the parades at the parks are also really good to watch.