this is when we go each year, for the last 5 years. i think others have covered the basics for you already. starting jan 2, the parks should empty out, but even on that mon jan 1, we stay away from EVERYWHERE, including downtown disney, and even the pools, its just crazy!

the resorts do stay full the rest of the week, 1)filled with marathon people who are out running every morning, 2) with
DVC members taking advantage of lower points.
one thing i have learned from the DIS boards, and found it to be true, that lower WDW time of year often means busy DVC action with people getting the most out of their points.
the other big difference for you is the riskier weather. if you can go with the flow weather-wise, its a great time to go to the parks. we do have some hilarious pictures of us determined to see fireworks during that week, bundled up and with raincoats because 45degree drizzlig florida weather at 9:30pm won't ruin our Disney Magic!!! lol
feel free to drop us a private message if you want more info on that week. we will be there at VWL, after a week at VB!