world trip from 3/08 - today (flew back early this morning).
When we arrived last Wednesday, we went to MK and it was incredible. We walked on or had very little wait for everything. At worst, like at Splash Mountain, we walked to the loading area and had to wait through five or six load cycles.
The first noticable increase in crowds started appearing on Sunday when crowds at MK had increased considerable, but were still very managable. We were back at MGM for a while on Wednesday in the morning and it seemed to me the busiest of the trip, but some frieinds that stayed until closing said it seemed like wait times decreased later in the day.
We have taken four trips now at different times in March due to Spring break(s) and I would say all of the attendance calendars that I have seen are spot on... first week of March- very light crowds. Second and third weeks of March- Moderate to increasingly heavy crowds. Fourth week of March through the third week of April- very heavy.
I think that I am going to try and plan our next trip the week(s)after the kids get out school for summer. Our schools let our the second-third week in May and I have heard that if you can go before the first of June, the crowds are light.