I find it pretty tough not to analyse as I read these days. I find myself deconstructing why I do or don't enjoy a specific book. It also means I tend to be awed by different things than I used to. I never used to get floored by amazing prose like I occasionally am now.
But funnily enough, the effect has been more pronounced on films than books for me. In the last few years, I've become much harder to please when going to the cinema. I'll walk out of a movie that all my friends enjoyed, and have a litany of plot problems that utterly ruined it for me, and that nobody else noticed or cared about.
I read as both, though I enjoy books that I read as a reader more.
It fully depends on how well the story is written, if I don't get "pulled out" of a story by things I read as a reader, but when I keep getting pulled out of it I read as a writer because I suddenly realise the techniques or other things of the story.