We were just there in December. My kids are 2 and 3, but we were with a 4 yo and a 7 yo. Here were our hits:
Hollywood Studios:
*Toy Story ride was a HUGE success with all of us. So much fun! (But go get a fast pass first thing the morning you arrive)
*Playhouse Disney
*character breakfast at Hollywood and Vine with Playhouse Disney characters
Epcot:
* Turtle Talk with Crush
* Nemo ride (scary for 3 and 4 yos, but 7 yo loved it)
* Soarin (if tall enough)
Overall, these two parks were a little "too old" for my two little ones, but our friends that had the 4 and 7 yos really enjoyed both parks.
SAHM to Pete and Repeat my "Irish Twins" - DD 12/06 and DS 11/07
Never argue with an idiot. He'll bring you down to his level, then beat you with experience.