I've been recently hosting workshops with various kinds of games, and can corroberate what Rebecca writes. Games are not only educational, they are fun and allow the players to experiment, and connect with one another - since usually the players haven't met before. If the game works well, it takes quite a bit of effort to get to the next item on the agenda :-). A brief game after lunch also works well to get energy back into the meeting. I haven't tried playing games regularly in day-to-day work situations. It might be a worthwile to try, as it loosens up a group, takes the minds of off the routine and allows (if done well) equal participation by everyone involved.
Lately, I've been doing a lot of thinking. Time to start playing?