We just got home Monday. Here is our review on the week... crowds were practically non-existant most of the days.
Wednesday at Epcot the longest wait we encountered was 20 minutes for Test Track.
Thursday Expedition Everest was walk on all day (we rode 6 times without wait).
Friday morning at MK was also deserted. We walked on Space, Splash, and Big Thunder Mountain. Returning Friday evening to MK for
MNSSHP Fantasyland was all walk on from 5-6 (exept maybe Dumbo). During MNSSHP the crowds were much worse but still most rides were walk-on's with much longer lines for characters and candy.
Saturday morning at Epcot we noticed a slight rise in crowds but not by much. MK Satuday night was a madhouse (Spectromagic).
MGM Sunday was still empty. The longest wait we saw was 20 minutes for ToT but it quickly went back down to 10.
Monday, Magic Kingdom seemed quite a bit more crowded lines were quickly reaching 30 to 40 minutes for the Mountains and it was a bit more difficult to get from place to place through the crowds. Maybe it was just a Monday thing with it having Spectromagic parade again this night.
IMO, it was very warm all week long. Most days the high was in the lower 90's and low in the 70's. A cold front had just passed by so I can imagine it could get much hotter. I think you will be fine with tanks all day long... no need for a sweater or jacket. Even at night I remember sweating some (especially in line at the bus stops).
The love bugs are still out in full force... they are everywhere in swarms. Some places you could not even sit on the benches because they were covered with lovebugs. They seemed worse at MGM and Animal Kingdom. We hardly saw any at MK. But don't let them bother you. They do not bite or sting... they just kinda get in the way sometimes, but no big deal.
You will have a great time! IMO, it's my new favorite time of the year to go!!