We go almost every year that week, its an amazing time at WDW. Just dont tell anyone. Benefits?
1. Lines are very short, we were able to ride every ride at least 3 times ( or more!)
2. Good prices
3. Great weather, be prepared for a cold snap thou.
4. Christmas decor is hit or miss, the parks will have it for the most part. Resorts may or may not. Poly was not decorated this year but was all past years...
5. Did I mention low crowds??
The xmas party is a nice way to extend a park day and get alot of rides with short lines.
I recommend arriving the Sunday before Veterans Day and avoid EP till Wednesday.