We were there from the 5th to the 9th this month, and the crowds were very easy to deal with, especially during the week. The 1st and 2nd were the choir thing (something processional?), and then there were cast member parties that closed DL really early, but getting there on the 5th meant we missed those.
I say that the first and second week are winners!
However, the ONE thing I missed was the start of the Electrical Light Parade. That started, I believe, on the 15th, and I do wish we could have caught that...but alas DH had to go back to work, and I couldn't convince my brother (DS and I were visiting him in San Diego) to get back up to DL to see it.