MK - People Mover, Monsters Inc., Carousel of Progress, Philharmagic
AK - Animal Trails, Tough to be a Bug, Safari, Take the train to the Affection Section my kids LOVED that
HS - All the shows (Citizens of Hollywood....we are really missing YOU), Toy Story Midway Mania, Mickey Minnie's Runaway Rail
EP - The performers in Italy and France are very fun, Living with the Land, Seas pavilion, Spaceship Earth
These are some of our family's favourites that are not the big popular rides. Honestly, just wander and enjoy. You never know what will be a hit.
Some years my kids just loved to play on the drums in AK, some years it was walking through the random spraying water at Epcot or watching parades and shows.
Don't worry if you don't get it all done, as long as you're having a great time, your vacation was a good one. I think people get bogged down in trying to see it all, take some time to stop and smell the roses.
Most of our fav memories from trips past have NOTHING to do with rides.