When we went at that time last year, it was surprisingly crowded. Not unmanagable by any means, but there were a few key things going on that lent to the crowds:
*The play for 7, pay for 4 deal.
*It was the week that Mission:Space, Wishes and Philharmagic all premiered officially- a LOT of press was there, as well as tourists!
I don't know if Disney will do that pay for 4 play for 7 deal again this year. Depending on the day (MK and MGM were open a little later on Saturday nights), the Animal Kingdom was open from 9-5, MK from 9-6 or 7 (I think it was 10 on Saturday night), MGM from 9-7 and Epcot from 9-9.
HTH~~