I read "It" in about a week, IIRC. I just could not put the thousand page (?) book down. Wake, work, eat, read, repeat. :)
The part in Nightmare on Elm Street that was kind of creepy was when the kids were singing in soft voices: "one two, Freddy's coming for you, three four better lock your door, five six, get a crucifix, seven eight, better stay up late, nine ten, he's back again...."
My wife was a Steven King fan and thought "It" was absolutely terrifying. Don't think I'm going to read it...