I've been to Scarehouse three times now. Each time has been a little better. The first time we waited in line 4 hours before we got in, which is a ridiculous wait for anything. The second time we only waited an hour or two. The third time we waited less than an hour. This is all thanks to a new system they implemented where you buy your tickets for a specific time slot in 30 minute increments. We reserved our tickets for 10:30 and it was so nice to roll in at 10:15 and be in the attraction before 11.
As for the haunt itself, it's much more theatrical and higher quality than your typical haunted houses or hayrides. Scarehouse is permanently in the buidling, so all of the special effects and props get to stay and it doesn't have to be deconstructed at the end of each season. This also allows them to continuously modify and change the haunts and improve them during non-season.
We were in a group of six, went in single file and we all got spooked several times. They make sure to scare everyone in the group, not just those in the front. It takes about 30 minutes to get through the whole thing.