I think that the idea that EPCOT is only for adults is the biggest myth out there. Yes, its probably the most adult centric of the four, but really, all of the four parks are more kid oriented than adult at the end of the day. I could see a lot of kids appreciating the fact that the rides at EPCOT don't get the big lines that the other parks do, and if they were intelligent enough, they'd love the Interventions and science parts of EPCOT. The park has a lot of hidden attractions that don't show up on FP+ but you can usually more or less walk on. There are also a lot of impromptu street shows that break out as well.
The show in front of the China pavilion comes to mind. My son loved that one. I honestly thought he would be bored stiff walking around the World Showcase and seeing the different countries. He's 7, so I just assumed. But he loved them. He liked seeing the different countries and even loved the 360 shows. Loved American Adventure too, I guess it was the animatronics.