we were there this past february (2/6-2/18) and loved it!
the weather was prety good; low 70's and some rain off and on the first few days (2/6-2/9), but then sunny and warm the rest of the trip. we used the pool many times.
crowds were almost non-existent and we walked onto most stuff; rarely used fast pass. closer to valentine's day and president's day, the crowds increased noticeably. it was still managable.
we just got back last week and i doubt that i'll ever go in november again. the weather was great, but the crowds were much heavier than in february. the f&w festival made parts of epcot almost impossible to get through and i was frazzled!
go for the first part of february!