I was there in 2003 and we went the week prior to TG. It was moderately attended during the week lines anywhere from no wait to 30 minutes depending on the time of day, attraction and park. By the Saturday prior to TG it really began to build and we were glad to be on our way by Sunday. Probably not what you wanted to hear. But, you'll have a blast whenever you go.
If it helps I have attached a link where they post attendance estimates for each day of the year.
There is a rather large preamble, if you just want to get right down to it scroll to the bottom.
Our Authorized Disney Vacation Planners are here to provide personalized, expert advice, answer every question, and uncover the best discounts.
Let Dreams Unlimited Travel take care of all the details, so you can sit back, relax, and enjoy a stress-free vacation.