I've only been to one "organized" shed, and I really enjoyed it while I was there. It was not just drums. There were keys, and bass, and horns...everyone did their thing. the environment was also very positive. That may just be that the organizers did a good job of planning it, and that was not the norm. But sheds like that, I am all for them. In fact, I have a few on the board, along with some clinics I plan to put together for next year.