I do. I sometimes even love them, even if they deviate from the plot of the original storyline. Like The Shining is brilliant, Christine is brilliant, and Needful Things is just as good as the book (despite being as far removed from the book as possible.)
Cujo, I have to say though, was completely awful. I usually find that the directors concentrate more on the blood and gore effect, rather than finding the storyline and the "heart" of the book. Which usually makes the movies look cheesy, and while they work great as horror movies, they usually are mindless drones of the original books they were based off of.