I'm also a horror movie enthusiast and even though this movie isn't what I would normally watch I do believe it's one the greatest ever made and my favorite from the 60's.
Visually it's beautiful, the acting is great and the music is haunting.

I saw it over three years ago and I loved that it had a perfectly Satanic vibe without being over the top.
Roger Waters and David Gilmour watch My Little Pony: Friendship Is Magic

I've seen this movie several times and I do find it to be creepy. Not in the same way that many other horror movies with lots of gore and special effects are, but scary in a more psychological sense. The idea that people you know and see everyday and think you can trust are hiding a secret is incredibly creepy. It kind of makes you want to be more aware of you're surroundings and more suspicious of who you are talking to, especially if they are overly friendly after you just met them. It's one of my favorite movies and one that I look forward to watching each year. I give it a 10/10.