We went that same weekend last year and we found it to be relatively tolerable, since we were prepared for it. We ended up standing in many long lines, but mostly we worked the FPs and tried to find less crowded attractions.
The problem was that lines for things like snacks and beer were always irritatingly long, and also there was some rain that made things difficult -- the crowded walkways at DL are even worse when people are carrying umbrellas.
The good thing, though, was that the nice cool weather made the whole situation much more tolerable. The decorations make everything much more beautiful. As crowded times go, it has to be one of the better ones, no matter how this year's experiment shakes out.