These are my faves.
MK - Cosmic Rays. They have a lot of variety from sandwiches to chicken and ribs. The chicken and rib combo is a great deal on the dining plan and can be easily shared. The only thing I don't like about this place are the different lines for different food.
Epcot - Sunshine Seasons at the Land. Once again great variety. They have some really nice salads and sandwiches. I usually get the Asain food, which is really good too. They also have a great bakery for desserts. You can get "real" desserts, not just a prepackaged cookie or cake in a bowl. Another good place on the
DDP, a lot of bang for the buck.
AK- I don't really have a favorite here. It used to be Flame Tree BBW, but the last couple of time we ate there I didn't care for it. But it's a good deal on the DDP and a lot of people like it.
DHS - This is another one I struggle with because there's no really great options like at Epcot or MK. I've ate at Backlot Express and liked it, but it's just burgers and fries. I've also had a good meal at ABC Commissary, though it seems like everyone on the DIS hates it.
DTD - Wolfgang Puck Express. Asbolutely my favorite CS on property. Lots of variety and very good value on the DDP. They have lots of variety, pizza, pasta, salads, chicken, plus more I can't even think of. They have some good desserts too.