We went down in March and had a great time. Do beware of the lines though, and make sure to take advantage of Fast-Pass for some of the more popular attractions. We got to the airport just over two hours before the flight home, and just barely made the flight. The lines for check in and screening wound their way throughout the entire terminal.
I did find a book about how to see WDW at the library after we got back, and wished we had it before we went. It had a lot of tips for each attraction, the best times, etc.