As a first timer this year and thought I would never, ever want to go to HHN again, I think this is the reason why I enjoyed my time. The houses were scary for me, but the gore and overly disturbing images (saw, exorcism etc) is something I don't think I would handle well.
Isn't 180 days the furthest out anyone can make a reservation? Sounds like me you were one of the first to proactively search for that day that far ahead of time. I'm sure it'll still be busy. Disney is always busy these days.
Yeah, I had even thought a Sunday would be better than a Friday or Saturday, but kids not having school Monday hurt me I think. I think the pass is definitely worth it if you're just going one day. I grabbed a "season pass" so I don't feel like I have to do every house every time, which is nice.