I can understand why WDW regulars would want the overlay, since it is something new. However, as a DL regular (who I am sure is in the minority) I HATE the Christmas overlay at DL. It was neat the first time I saw it, but after that is just ruins the ride for me. It makes the lighting too bright and some of the effects really bug me (i.e. the dancing ghosts in the ballroom scene dancing in the middle of a Christmas tree). We usually end up going for fall break, so it ends up being the version that I experience the most.
I know I am one of the few that doesn't love, love, love it, but I don't think the east coast is missing much by not having it.