Very crowded, especially with this nice, crisp weather. This is also Candlelight weekend, when the Candlelight Ceremony takes place in the Town Square on Main Street, and the Town Square is all set up for that. Parade times are changed earlier, so the Christmas parade only performs in the daytime and not at night.
Expect big crowds and long lines, but then that is the case on any weekend from mid November through New Years. But with the Candlelight Ceremony taking place this weekend, it's going to be a tad crazier. You might catch a break on crowds and lines for a bit late on Sunday night, from 9PM to the Midnight closing.