Nov 22, 2007 is Thankgiving Day. If you meant Nov 17-22 this year, then your dates include the Sat-Thu of Thanksgiving week. Crowds at all Orlando parks usually begin to increase that weekend and build with each day of your trip, becoming quite large and busy from Thu the 22nd thru Sat the 24th. Due to having only 2-3 school/work days that week, many families find it an ideal time to vacation, so the crowds can be pretty big.
In 2008, Nov 17-22 dates include the Mon-Sat prior to Thanksgiving week, which ought to be fairly quiet. HTH.