I find it interesting how different the AP discounts are between WDW and DLR. As a DLR AP holder we pretty much get discounts at all stationary food places (QS, TS, even ice cream parlors). The actual discount varies depending on the pass, with lower ones 10% across the board, and Signature 15% everywhere. Even at Food and Wine, the booths give discounts. Only place that doesn't have them are things on wheels-like churro/ice cream carts. There is also a merchandise discount everywhere (except for wheeled booths), with 10% for low passes and 20% Signature.
When I was doing my calculations to determine if a Premier AP was worth it I was very surprised to see the limitations on the actual AP discounts! At least we will be going in September so will take advantage of the higher "birthday" discounts. (Also, in case you were curious, the Premier did end up coming out better once I considered ticket costs, memory maker, and dining/merch discounts.)