Many of the schools in WNY are off that week too (that would be the Buffalo & Niagara Falls area to the PA border). I know we are currently booked that week and have to decide by tomorrow morning if we're still going. We're probably rescheduling to the first week of May, but it's for work related reasons, not the possible crowds.
Anyhow, I do know that booking a flight was interesting. I booked in mid-Feb for this trip. Anyhow, at that tiime, many Southwest flights were already closed, and there were 2 days that were booked solid. I ended up w/ Jetblue because SW had very little available to Orlando from Buffalo. Usually we have our pick of flights and usually the cheapest fare.