Harry Potter can probably be blamed for that, as it was really the book series movie franchise that set it off. But it made sense for it as those books had gotten so long and trying to fit everything from the later volumes into one movie left a lot getting cut and it still feeling it was crammed.
Well tomorrow night I'll be adding to this weekend's box office total at least. And if I like enough I'll probably go see it again before it leaves theaters, but mainly because I am lucky enough to live in an area where movie tickets are cheap.