My wife and I will be attending our 8th HHN this October. We have gone every year since 2006. We are in the older category. Late 30's, early 40's and we love it! Yes, they do sell quite a bit of alcohol and some younger people can get obnoxious. However, I have noticed that the presence of the Orlando police has cut down on the drunken hijinx. Just like any other event where alcohol is served, you are going to get some people who like to over do it and act crazy. For the most part, it's just young adults having fun.
The haunted houses and scare zones are top notch. They do have security in the houses, mostly for emergencies and to protect the scareactors. I do not find them to take away from the atmosphere of the haunted house.
The Bill & Ted Show does get rowdy. Especially the final show of the night. However, they do warn you that it is not suitable for young children. For adults, the show is great and pokes a lot of fun at current events, pop culture and even Universal itself.
I suggest going on a Sunday or Thursday. My wife and I can see all the shows and houses in one night. However, we do get the "Stay and Scream" option on our admission. Basically, you are permitted to stay in a certain area while they empty the park of other guests. You then have access to certain houses before the open the gates for the actual event. Usually 45 minutes before. We are able to get half of the houses done in this time period and the longest we ever had to wait in line was about 30 minutes.
Can't wait to return! :sohappy: