I went with my Best friend and our 2 DD's both age 7. We started out in AK Did- Bug's Life, Kali Rapids, & Kilamanjaro Safari then on to Epcot Did- Spaceship Earth, Canada, France ate at San Angel then on to Magic Kingdom where we rode Teacups, Small World, Peter Pan, Splash Mountain and Haunted Mansion. (Haunted Mansion was our last stop. It was closing time and that area of the park was almost deserted. We were the last people on the ride. And believe it or not my friend and I really got spooked. The CM's are so in character!!!)
Our final verdict was that we would never do more than 2 parks in one day. We wasted so much time and energy moving from one park to the next. We felt like we were in a panic all day.
Sorry I can't recommend it.
Cin