It might also be worth mentioning that you may not even really need the Express if you are doing rides.
For the MOST part, Everybody is in the park to do the houses, so the ride lines are very short compared to what they tend to be during the day.
Which also goes to say.... Why waste your HHN riding the rides when you can do them during a regular park day? The only ride (I personally) felt was a "must do" during HHN was Jaws. just because it was an entirely different experience after dark, and it was so rare that the park was still open that late during my normal trips. Now, I can't think of anything that would be a must-do after dark and therefor worth the wasted house time. [Most US attractions are indoors, so day/night, no real different in the experience. Rip/Ride/Rocket's Lights are cool at night.... but I feel they are better enjoyed from the ground than on the coaster]