We went last year over thanksgiving, but rather than taking the kids out of school mon-tues before thanksgiving, we toured the wed before TG until the tuesday after. Crowds were very light Sun - Tues and airfare was dirt cheap!
We followed the advice on touringplans.com, avoided parks with extra magic hours, and were fine. it was crowded, but wasn't hard to navigate the crowds.
Wed - Did HS. Waited an hour for TSM at rope drop, but using fast pass didn't wait longer than 10 min. for anything else. Park was crowded though! Peak waits at TSM was 90 min, RRC 75 min, and Tot 60.... but get fast passes in the morning and you're all set.
Thurs (Thanksgiving) - toured AK. minimal crowds; no lines over 10 min. using fast pass. I didn't see a posted wait time over 30 minutes including everest and safari. We did the fantasmic dinner package that night. we were there early with our reserved seats but people were definetly just walking in and getting seats up until around 20 minutes before show time.
Fri - toured MK. toured rope drop to 1pm and 7pm - after wishes. used fast passes for major rides and we waited less than 10 minutes for everything. took a break with lunch at wispering canyon and pool time at OKW during the day
Sat - non-theme park day. pool during the day and DTD at night. DTD was beyond packed! Had reservation for late dinner at California Grill and watched wishes before dessert.
Sun - toured Epcot center with very light crowds during the day and did
MVMCP at night. very managable crowd at the party, and did a ton of rides in addition to the parade, fireworks, and castle show. We walked onto test track at 10am, and soarin was very easy to get fast passes twice. i don't think anything else gets a line in that park.
Mon - slept in and spent late afternoon-park closing at Epcot. There was almost no-one at epcot. we walked right into the last show of the candlelight processional without a wait! and had plenty of room in Japan along the railing for illuminations. we didn't check out the headliners that day, but i don't think anything had much of a wait except soarin.
Tues- i've never seen so few people at the Magic Kingdom! I was sad that we could only stay until 2pm until we caught our flight, but it was beyond uncrowded!
I hope this helped to give you a sense of what touring the parks was like.