With a lot of the table service restaurants being booked up so far in advance, we tend to just have counter service if we are eating at one of the Disney Parks.
We always head for Cosmic Rays in the Magic Kingdom, although I have yet to try Be Our Guest, so that may very well change.
When we are in Epcot we tend to go to the Boulangerie or the Tangierine Cafe in World Showcase or Sunshine Seasons in Future World.
There isn't really anywhere we eat in Hollywood Studios, possibly Starring Rolls or Writers Stop at a push.
Animal Kingdom is another place we don't really eat, we just snack. We have had a pizza at Pizzafari though and that was nice.
At Downtown Disney, there really is no competition it has to be the Earl of Sandwich:D
What are your favourite counter service restaurants at WDW?