Then of course, there’s the matter of many of his novels (Under the Dome, Tommyknockers, Dreamcatcher, It) being effectively science fiction rather than supernatural per se. Even many of the supernatural ones kind of skirt sci-fi and vice versa. Although most of these would be hard to turn into fiction that doesn’t involve some kind of fantastical element, whatever it’s source.
And there’s plenty that already have no fantastic elements as far as I can remember - Roadwork, Apt Pupil, The Body, Shawshank, Misey, Dolores Claiborne, Gerald’s Game, Colorado Kid leaves it up in the air.
I think the Stand was more interesting in it’s post-virus bits and not as interesting in it’s attempt at supernatural epic, so that’s an easy one.
I didn’t even realize Cujo had supernatural elements. Did the film?
Needful Things might have been more interesting without the supernatural elements, although it would have taken some sharp writing to make the titular needful things as psychologically addictive.
Low Men in Yellow Coats could have been done just as ex-CIA guy on the run bonds with kid.