Hi, Ellie, There are some great restaurants to experience while at the Disney Theme Parks. On your next vacation, you really should try one or two dining experiences!
The Picnic in the Park is new at Animal Kingdom. For a great overview of this, read an answer
HERE from Disney Mom Anna. This is actually just a counter service meal, but with a bit of Disney "fun" tossed in!
Some restaurants you might want to try:
Magic Kingdom: Crystal Palace (buffet with Pooh and Friends)
Epcot: Try any of the restaurants in World Showcase. Teppan Edo is a really fun place and good food.
Hollywood Studios: Sci-Fi Dine-in Theater or 50's Prime Time Cafe are both fun dining experiences. For something more upscale, try the Brown Derby.
Animal Kingdom: For this, head to Animal Kingdom Lodge and try Jiko. A wonderful dining experience. And don't forget to try the Picnic!
Have fun dining around Walt Disney World!