Nice trip report. I enjoy seeing a park, that I have been going to my entire life, through the eyes of another. I liked your reference to Knobels. I thought the exact same thing a few years ago when I first visited Knobels, except in reverse. Knobels reminded me of old Lagoon (20-30 years ago).
You must have gone on a slow day, I have rarely seen it with that few people. I like Frightmares, not for the haunts, but because the crowds are not there.