I certainly do it. I need to understand where a book (novel) is going before I start reading it, otherwise I find it utterly confusing because I cannot sort the incidents in it out; to know what is important or significant and what isn't and I just get bogged down in a morass of incidents which I cannot differentiate between.
With factual books, and most of my reading is factual, I do not read the last chapter, but I do spend a long time reading the cover blurb, and all the scramble egg at the front, Index to chapters, pictures, maps, diagrams etc, authors preface etc.
I think I like to understand the landscape of a book before I start reading it, using a map rather than satnav.