Last dinner isn't as much of a tradition as last breakfast (my girlfriend insists on Chef Mickey's for breakfast on the day we fly home). This coming trip, our last dinner will be at Shula's.
Just a side note, with an 8:10 ADR, don't plan on being seated at 'Ohana before 8:45. Odds are you won't get a good view of Wishes since those sitting at the window tables won't leave until after. There is not a lot of viewing space. Your better off trying for an earlier ADR to give you time to get to MK or at least find a spot on the Poly beach, or get a later ADR for after Wishes and watch from either MK or the Poly beach.