We usually spend a full day at DHS. My kids were 9 and 4 on our last trip. We like the Playhouse Disney Show(which now has Handy Manny, Mickey's Clubhouse, Little Einstein's), Little Mermaid Show, Beauty and the Beast, Muppets 3D, Great Movie Ride, all the character Meet n Greets(Mike & Sulley, JoJo and Goliath, Lightning Mcqueen and Tow Mater and so many other hard to find characters). What I like best is the shopping!LOL I think they have the best shops at DHS. We also loved the parade(our kids got to be in it last time)but there is a new one starting and it looks like fun. 50's Prime Time Cafe is a must for us, the food and atmosphere are great!! There will be a new Toy Story ride opening there soon which should be a lot of fun.
For us, the only park we either skip or do just a half day at is AK.