You may want to check out the the touring plan site. They have a crowd planner but is done individual days based on history. Below is some of the information listed on the website. The website is a companion to the Unofficial Guide to WDW, which is a great book published yearly. The website is about $8 a year and I think it is helpful if you have an upcoming trip. Hopes this helps.
Date Crowd Level Best Park(s) Park(s) to Avoid Notes
Wed, 26 Dec '07 10 MK EP DS AK
Thu, 27 Dec '07 10 DS AK MK EP
Fri, 28 Dec '07 10 EP AK MK DS
Sat, 29 Dec '07 10 MK EP DS AK
Sun, 30 Dec '07 10 DS AK MK EP
Mon, 31 Dec '07 10 EP MK DS AK
Tue, 01 Jan '08 7 MK EP DS AK
Wed, 02 Jan '08 6 DS AK
Thu, 03 Jan '08 7 EP AK MK
Fri, 04 Jan '08 6 MK AK EP DS
Sat, 05 Jan '08 7 EP AK MK DS
Sun, 06 Jan '08 6 AK MK
Mon, 07 Jan '08 6 EP DS AK
Tue, 08 Jan '08 5 MK EP DS AK
Wed, 09 Jan '08 5 DS AK
Thu, 10 Jan '08 6 EP AK MK
Fri, 11 Jan '08 5 AK EP DS
Sat, 12 Jan '08 6 MK EP DS AK Half Marathon
Sun, 13 Jan '08 5 MK EP DS AK Marathon