I believe that seeing correct and typical English sentences helps a lot to learn how to use English properly. It is also important to read and read again every structure that is new to you, so that you can remember them. If you only read the book without taking any pause to think carefully about the "new" sentences, you will hardly remember any of them.
I've read all Harry Potter books straight myself, and when I opened them again, I realised I had viewed loads and loads of useful structures whithout remembering them - which was such a shame! I'm reading The Full Monty (Penguin Readers collection) using the "pause and think" method at present. Now after a few days of daily reading, when I take a look at an English text, many structures are familiar to me - "hey, I remember reading this one in The Full Monty!".
Therefore, I believe this method is efficient and I would advise it to all learners.