I used to move things around every few weeks - like others, it makes things fresh and new and is a lot easier than moving to a new place - which I also love doing. Unfortunately, the apartment I'm in now seriously limits my options with it arrangement of windows, doors, and a stupid place for a cable connection.
On the other hand, moving furnitaure takes a physical toll now so it's probably as well I don't do it as often. But I still do it within the limits possible. There's nothing better a whole new arrangement of the furniture! Living alone, no one else gets disgruntled with my footloose furniture.