I've never been able to get into The Shining — or much of King's writing — so in that sense I agree with you, and feel like maybe we're in the minority.

You might ultimately be right about why King was unhappy with Kubrick's film, but my understanding is that at least ostensibly King's fundamental concern is that the the film wasn't as sympathetic to Jack as he intended it to be. King meant for Jack to be a diseased but sympathetic victim of the hotel, and feels that the film portrayed Jack as a villain who is an interwoven part of the hotel's menace. I always assumed he felt attached to this issue because of his own struggles with substance use earlier in his life, with The Shining being part of his recovery and rehabilitation, and Jack being a sort of projection of how he felt.

That's just my general impressions though. I'm not either a King or Kubrick devotee, although I respect both a lot as artists. I do feel that the film in particular is a masterpiece, and have always felt a certain discrepancy between how I feel about the novel and the film, so I've probably read more about it than most film adaptations of books. I could easily be missing something important, or misunderstanding something.