Last trip, I found that everyone who served us (at TS, QS, carts, whatever), was very nice and incredibly knowledgeable. We didn't have a single problem in 10 days.
I did have a few servers that mentioned that the tip isn't included, but they did it so matter-of-factly that it didn't feel at all weird. They just included it in their explanation of the bill (which is a teeny bit complicated). "This bill shows what's been charged to your dining plan, so check that and sign it if it's correct. This bill shows what isn't covered by the dining plan, the tip gets written here, you can pay this bill with cash, credit card, gift card, or charge to your room. This copy is for you, this copy is for me."