I've been on both the DL and WDW Haunted Mansion and I like them both because they're slightly different. Therefore, riding either one is not like riding the "same old thing." So you can imagine how I felt when I rode The Nightmare Before Christmas version of the DL Haunted Mansion a year and a half ago. My jaw hit the ground. The ride was 'fresh' with new images, storyline, and music. I think it's great that the Imagineers took a familiar ride and revamped it for a few months at the end returning it to its former glory. I've never been to WDW during the Holiday Season, so I don't know if they do a Holiday makeover like they do for DL's Haunted Mansion and Tis a Small World. Wouldn't it be cool if they could do that for more rides? And by that I mean change them every so slightly for a few months out of the year, so it's a 'new' ride experience.
Oh, and I just rode WDW HM end of May, and it was fine.