Just a minor anecdote, and maybe everyone else was already aware of this.
I was just messing around with some dates in February for a possible short trip. At my first search I noticed that a ton of hotels were seemingly booked up. I was like, wow, maybe this is a really busy time and a lot of people are booking again. But then I started adding dates to either end of the trip to bring it closer to a week, and suddenly a bunch of hotels showed availability. So it can't be that they were booked, since I didn't shift dates but instead extended the trip. It makes it hard to know how busy things really are. But what's the deal with not being able to stay at (for example) Carribean Beach unless we go for 6+ days?
(For what it's worth, now that I've seen the prices, we're almost definitely not going to go anyway. We must have gotten a killer deal last summer because everything is much more than double what we paid. At the time I was wondering why everyone said the hotel prices were too high, but now I see what you mean.)