As much as I agree with you that I'd love to see more holiday overlays, there is one thing we are ignoring. Walt Disney World is NOT Disneyland. The major difference between the two parks, is that Disneyland's guests are almost always returning guests, or going to become returning guests. A majority of Walt Disney World guests are Once in a lifetime guests. The guests at WDW are coming from around the world, and the country specifically for a once in a lifetime vacation. Yes, it has a HUGE return rate. But still, that return rate is based on people getting to experience as much as possible. When you close an attraction, even for a short while, you cut off that experience to hundreds of thousands of new guests. This in turn has shown to decrease the amount of people willing to come back. When a new guest comes, and they see too many refurbishments, it dampens their experience and they are less likely to return.
I 100% see your point of view as an already returning Disney Guest. But to new guests, disney already lacks in amount of attractions compared to their local amusement parks (I know we would never compare the two), but to a new guest this is a big deal. When they come to WDW and see closed attractions, they feel cheated. And rightfully so.
Just a thought.