Well, our experience with WP Express (CS) was this:
There are 2 WP Express locations- one at Westside, and one at Marketplace. We went to the Westside location, and (my mistake) ordered w/out telling the CM that we would be using the Dining plan first. We stood in line, ordered, got our food, then went to pay. At that time, we were informed that only the Marketplace location participated in the DP. We went ahead and paid the $22 for 2 pizzas and 2 drinks, but weren't real happy about doing so. We ended up leaving the next day with 5 unused CS credits, 2 of which we could have used at the WP Express on the Marketplace side of DTD if we had known ahead of time.
I don't know if this was a case of an uninformed CM, or what, but I was a bit put out about the idea of the same restaurant honoring the DP at one location, but not honoring it a couple hundred feet down the street.
**Oops- editing to add that I didn't read the part of the OP that said the TS, not the CS. Sorry- the Cafe is on the DP, but not the more expensive upstairs Dining Room.