Instead of trying to second guess my kids I always ask them. Here are their answers for the don't miss rides by age
6 yo (was 5 last trip)
MK: Tea Cups, Buzz Lightyear, Dumbo, Peter Pan, Goofy's Barnstormer, BTMRR, Splash, and she is looking forward to the Flying Carpets.
Epcot: Rio de Tiempo (Mexico ride), Ellen's Energy Show, Spaceship Earth
AK: Kali River Rapids, The train to Conservation Station, Killamanjaro Safari
9yo:
MK: BTMRR, Splash, Space, Goofy's Barnstormer, Haunted Mansion, Buzz Lightyear, Pirates, Tom Sawyer's Island
Epcot: Ditto above plus Body Wars
AK: Ditto above plus going to see the gorrillas
We are doing MGM for the first time and 9 yo is very excited about RnR but not sure about ToT.
As for shows, they all said, "All of them!"
36 more days til WDW!!!!!!