The Conjuring is a movie you find yourself thinking about late at night when you're in bed not wanting to open your eyes worrying about what will await you. The film truly psychologically affected me the first time I saw it with some truly well earned scares where tension builds through brilliant use of sound and camera work that builds tension until the last possible moment where the movie gets you. A scene in particular involving a wardrobe really freaked me out and made sure I never look at one the same way.
If anything the movie seems to lose strength in the second act in terms of scares focusing more on the story which is admittedly intriguing if unoriginal, the second act still has scares but not as many as that first act which did truly get in my head for a couple of days. Well worth a watch for true horror fans.