Went back on Friday night, and had a great time! I can't really fault the park for being unprepared last Sunday, since I was obviously unaware as well. Crowds were minimal, had no problem experiencing all the houses and scare zones in the 4 hours I was there.
The atmosphere absolutely puts BG to shame. Every corner of the park was at least hazy, if not heavily fogged (to be fair, the weather was ideal for fog), there were absolute loads of scare actors in all areas. I stopped twice at The Parched Pig to have a beer and watch the actors. Several times they chases people THROUGH the bar which was highly amusing.
21 was probably my least favorite house of the night, and it was absolutely on-par with Nevermore which was my favorite BG maze.
All the employees I interacted with were friendly and helpful, and I even had a prolonged chat with a group of high-school kids in front of me in line for No Vacancy who were well behaved and polite. Now I understand that light crowds, helpful employees and polite guests aren't necessarily the norm, but everything was really great on my 2nd go round. I still have a preference for BG overall, but at least I no longer regret picking up a KD pass again.