For buffets out here we usually have to get our own refills, at that point I feel leaving a tip is not needed; however, at some of tose buffets you ocassionally get a host/hostess that will ask what you are drinking and will keep it refilled (even though it is not his/her job to do so), I do tip in those cases as to me that's going above & beyond. As for Disney Buffets, the tip is always included at the DLR (except at Story Tellers, but that mixes a buffet with a full service restaurant, so it's a bit different). At WDW I never seem to have very good servers at the buffets when paying OOP, I had one meal where I had to get up and ask the manager to get me a refill on my soda, because I had not yet recieved a refill, at that restaurant, the tip left was one penney as I did not see my server after he brought me my first drink, it was even the manager that brought out my bill in hnd sight I probably should have asked that the bill be reduced even, perhpas even eliminated as the lack of service ruined the meal, I was by myself at the Crystal Palace and wanted to get some photos, I finally go the person sitting at the table next to mine to take some pictures and I returned the favor for thier group, as they were having similar problems. At a buffet a server has two responsibilities: Clear the plates and refill the drinks, neither of which was done my entire meal, except once by the manager. I had a similar thing happen at Hollywood & Vine for a dinner when paying OOP. Now when using the dining plan at Crystal Palace (Party of 7), Hollywood & Vine (party of 7) and Boma (Party of two) plates were promptly cleared, drinks were refilled before they were half empty and the servers even offered to help bring food back to the table, take pictures, etc. Out of the group though I would say that Hollywood & Vine had consistently the worst service of the group.