Many times we eat snacks and don't eat lunch in the park. Here are some of our favorite snacks and must visit restaurants.
Magic Kingdom
Dole Whip
Mickey Pretzel (DS 6)
Casey's
EPCOT
Anything from Karamell-Küche
Hollywood Studios
50's Primetime Cafe
Animal Kingdom
??? I need to look for more snacks there!
Downtown Disney
We love those custom apples from The Candy Cauldron.
At the resorts:
Mickey Ice Cream Bars
Jiko (Animal Kingdom Lodge)
Boma (breakfast) (Animal Kingdom Lodge)
Artist Point (Wilderness Lodge)
Whispering Canyon (Wilderness Lodge)-
This is an amazing place to dine with kids...be sure to ask for lots of refills and see what happens. 
Cape May Cafe (Beach Club) our favorite breakfast stop
We always take Rice Krispie treats home from our trip (anything to make the magic last a little longer)
Can't wait to hear some other favorites especially the ones from EPCOT...so little time for so much good food!