Last fall as we were checking out of WL, we saw Kevin Weisman, who plays Marshall on "Alias." He and a couple of guys were checking in. I don't know if he counts as a full-fledged celebrity, but I know him from a couple of other shows and recognized him immediately. He wasn't being approached or anything, possibly because he was on his cell phone most of the time. I think he might have been there as part of the Mission: Space grand opening, because it took place the following day, or possibly as a guest on the Wayne Brady show, which was filming at Epcot that week.
My husband and I are easily star-struck (when we vacation in Los Angeles, we go to movie premieres just to see who's there), and it was a nice way to end our vacation.