We went over last weekend (Thursday through Saturday) and thought it was pretty crowded. Our schools have a long weekend every mid-October when lots of educational conferences are held. I usually won't go at this time because of crowds, but since DH and DS were in D.C., my younger son and I grabbed a last-minute room from Priceline and went over.
Thursday at MGM was not bad. Friday at Epcot was a little busy. We attended the AP sneak preview of the Nemo ride and were shocked by the long line. After lunch we visited the MK. We only rode Pirates which was very crowded and Stitch, which had a small line, then saw the parade - not crowded. Saturday, the AK seemed a madhouse to me. We'll just have to see what happens now schools are back in session.