Why The Shining is Terrifying?

That is, what makes it terrifying for the author of the video.

The movie isn't scary to me. It is mostly unpleasant. It isn't scary, because it is all too obviously meant to be scary. If you can see through it, it loses its power. At least that is my explanation.

But it is definitely unpleasant. You have things like a beautiful naked girl arising from the shower, and then that girl turns into a hideous and hysterically laughing, diseased old hag. Disgusting!

Then there was the scene with the guy in the wolf mask. It wasn't until this video that I finally got what was intended there. It didn't look like a wolf mask. It looked like two dudes in bed, and one was dressed up in some sort of weird costume. I didn't see anything bloody or anything like that. What's so scary about it? It's just repulsive.

The elevator flowing with blood just wasn't plausible in any sense.

There was some mildly scary stuff with Wendy's discovery of Jack's "writing". He is obviously insane at this point, and he's threatening her. You wonder if she's going to be able to get away from him.

The scene where he is chasing Danny in the maze may be somewhat scary, but that is also somewhat implausible. How does a little kid outwit his father?

All of this leads to the question of "what could have been done differently"? Evidently it is truly scary for others, but not for me. I would think that something to be truly scary, you'd have to be a part of the scene somehow, and find it believable. Maybe that's why it doesn't scare me. It is too obviously intended to be scary that it gives itself away as a scary film. That's not scary unless you don't think it's obvious.