I use to change my furniture around once or twice a year, but its gotten to the point where everything is stuck where it is for one reason or another. It bothers me too, because that's how I would make everything look new and fresh.
We only move the furniture when we absoulutely have to. We both like things to stay the same. Not to mention that we don't have a lot of space and many options on how things get set up. We usualy arrange for the best use of the space. We are off to buy new bookshelves....and we will re-arranging things to be able to fit those in. I am one of those book crazy moms and have bought a bunch of books to keep them busy through atleast 5th grade. Hello....I have an addiction to book buying.
I am working on re-arranging my house right now. I don't do it often though, that crap is heavy and since it is only DS and me (and DS isn't much help with the heavy stuff) I don't want to break myself moving stuff.