I think that a lot of it depends on when you visit. I usually go to WDW in the off season so I didn't have a lot of problems. In the summer time, there are a lot of locals that are out of school hanging out at DQ. In Nov, you should have less crowds - but I wouldn't recommend going there after park hours. DQ is one of the last places open after the parks close, and that's where people flock to!
I really enjoy going to DQ. It's usually included in my tickets so I go here and there for a few hours. I can't wait to take my Dad there this Dec - he will LOVE it!
D4D