Need Help with Planning!

[UGAHokies]

We are currently early on in the planning stages for our trip to DW in 2009. We are looking at 2 possible weeks, March 6-13 or August 8-14. We saw that disney is offering some really nice incentives for traveling in the spring; our concern however is the crowds since this will be during peak season. We were wondering if anyone has traveled during these times, and how bad the crowds are? Our last visit to the world was from July 30-August 3 of 2007, and our only real complaint was the heat and the short thunderstorms that happened almost daily (which we did not really mind at all). So....my question to everyone is whether or not there will be a noticable difference in crowds during early March vs. early August.
Thanks everyone!!