The Terror Tram is very neat for movie buffs like me. Getting to walk through the Psycho sets is cool, let alone the chance to spend 20 minutes in general on the backlot.
That being said... it's often the victim of budgetary constraints and can be repetitive from year to year. Although, I will say, Scream last year featured an especially cool moment where a victim was chased by Ghostface into one room, only to be dragged by Ghostface (by the feet kicking and screaming) down the hallway and into another room.