I think most of us find a break to be very good at some point. I stopped playing WoW for about 2.5 months starting in September. The game had gotten a bit boring and I figured I'd wait on WotLK, then realized that I didn't miss the game so I didn't play right away when the xpac came out. I just got back to multiboxing two or three weeks ago. So about three months without doing it at all. I still solo a lot and am just PLing through Outland, but it's fun again, and probably would not have been fun if I'd been doing it until now without a break.