I've been there twice- in November 2005 and February 2006.
In November 2005 we went there at about 7:30 and it wasn't crowded, it was in early November though, not mid. I think you should be fine, they have alot of seating (inside and out) there. But if you are going close to Thanksgiving, it is VERY crowded during that week.
Hope you have a great trip, and good food at Wolfgang Puck Express- it is one of my favorite CS places.