We went the last week of February 2013. The weather was perfect! It was chilly in the mornings and evenings, but middle of the day was a perfect 70-75 and sunny.
I can't wait to go back! It really is an entirely different world if you are used to travelling to WDW. There is no real advantage to staying on site, (you can get a beautiful room across the street for $150 per night or less), you don't really need to book ADR's, (and the places that do need them can be booked 24 hours in advance rather than 6 months), and regular old' paper fastpasses are the rule. It is so relaxed and leisurely that a lot of WDW vets go crazy because they don't need to plan anything.