I agree! (concerning The Girl Who Loved Tom Gordon) I read it a while ago and on the surface it doesn't seem frightening, but when you really start to get into it and the mindset of the girl and thinking about how you'd feel in that situation, it does play with your head. I really liked the book looking back, quite a simple idea but very well written.
Stephen King is one of my favourite authors and i've read a lot of his work, just about to finish The Dark Tower series for the second time (only about 250 pages of the last book to go) it's absolutely amazing, i love the characters so much. It's so many genres and ideas rolled into one too xD