I notice it a little bit. When I scan during reading, sometimes I want to re-read the part of the sentence that was on the previous page, which is when this is a nuisance. It got a lot faster with updates, though. I saw what the original Nook software page turning rate was like and I don't think that would be acceptable at all. So glad to hear that apparently the Nook is improving via software also.
Yeah, I agree, having to move back pages is a bit slow, but turning forward is quick enough that it becomes transparent after a while. And the slow page turning on the Nook really looks like a buzz-kill to me, which is a shame.