We would go in May when my kids were little, back in the 90's..the way I remember it, beautiful weather, low crowds. As kids got older we did the summer..hot weather, afternoon rains, very crowded. Kids now in college so we went in May 2009, still talking up how great this time of year is. Florida had record rainfall, had a tornado warning and the parks close earlier than summer. Never heard the end of it!!! We are now going in August 2011, hot weather, afternoon rains, and staying at the parks til close(we do every Extra Magic hours). We also stayed in the 600 loop and didn't mind it at all. But as you can see we aren't at the camper all that much either. We had the site right near the bridge so it wasn't a long walk to the movie or pool. Bus stop was right across the street, we had a cart from Kenny (also had 4 sets of golf clubs and 4 adults in a 4 seater cart) which turned out great cause he has flaps for the torrential rains.. so we didn't use the bus. But I'm not complaining cause we are all together in my little fantasy world called Disney no matter what time of year it is.....Gotta go I'm starting to tear up.
Go with the flow and Enjoy!!