We were there March 14-20. The crowds were the worst we've seen and we have been there for our spring break in 2004 and 2006. We saw waits of 90 or more (we saw 110 and 120 sometimes) most of the time on Space/Splash/BTMRR/RnR/TSM etc. We ended up waiting an hour for the safari (it said 40 when we entered) and almost an hour in the single riders line on RnR. Almost all of our fast passes were for more than 2 hours out when we pulled them and so we had to wait two hours to get the next which usually meant we could only get two fast passes before they ran out. Now since we had been a number of times before, we only worried about getting there at opening at Hollywood Studios so that we could get to Toy Story Mania. We ended up seeing what we wanted, but could only ride some rides once or twice instead of the multiple times we can in the off season.
The crowd predictions before we left were 6's - reality was more like 9's or 10's. This is probably why they are changing your predictions - they were proved wrong already.
We moved over to Universal after Disney - crowds were much lower over there. Although it didn't really matter as we were staying on site and had express pass on all rides with the room key.