We were there last week too. March 6th-12th. The weather was great. Hot for the first two days. Chilly for two days. And, nice and warm for two days. Sunny every day though, so it was beautiful.
We were at the Magic Kingdom on Wednesday and Friday and thought that it was much busier on Friday than on Wednesday--lots of cheerleaders. Never waited more than 35 minutes either day though and that was just a few things. Practically walked on several things Wednesday (don't get me wrong...it was definitely busy, maybe we just chose the right time for several attractions). I think Dumbo & Pooh were our longest wait there at 35 min. We loved Fast Pass. Of course, we were with a 3 & 4 year old so we did not do any of the big things, so our opinion may have changed had we done that.
Did Epcot Saturday 3/6 and the wait-times were practically non-existent. Waited 20 min. for the Land ride, I believe, but literally walked on Journey of the Imagination and several others.
MGM was Sunday 3/7 and then Thursday evening. Got to see all the shows we wanted including Fantastmic. Crowded but never waited more than 30 min. to get into anything.
Animal Kingdom was Thursday...it was crowded but once again, no unbearable waits. Wish we had more time to spend there. Everyone had said we could see it all in one day, but we missed a lot and even stayed until 6 when it closed at 5!
Animal Kingdom Lodge (where we stayed 3/9-3/12) CM's told us that they weren't full at all last week, but expected it to pick up dramatically this week.
(Monday and Tueday, dh was in a conference, by the way, so the kids and I entertained ourselves at the Hyatt Grand Cypress (where we stayed 3/6-3/9) while he worked--they had a pool with waterslides, bike rentals, beach, boat rentals, playground, etc.--nice break to be able to rest in between park visits like that.)