We're thinking about getting DDE and it probably makes sense for us but I'm curious if it can be used at CS? We're not doing DDP and are bringing most of our food but I know we'll be having at least one of those amazing 'seared tuna salad' at Seasons in Epcot.
Unless I am wrong I don't think you can use it for a counter service location. Last August I went to the Magic Kingdom with one of my friends from Orlando and when we went to Peco Bills she asked if she could use her DDE card and the Cast Member said no.
We've used it at POFQ food court as they don't have a sit-down. My understanding is that you can only use it at a resort food court that has no sit-down eatery nor park counter service.