According to all of the information that I can find on the Haunted Carriage Rides, the first one is not scheduled until October 2, 2009.
So, one would need a time machine (or at least a flex capacitor or something) to have experienced it yet in 2009.
I'll bet someone (cough, cough) will try it out this year and post a report (cough, cough), but the someone I am thinking of will not do so until mid-October.
TCD