There are just too many people for the facility. Last time I went I just camped out in a devroom that was of the most interest overall. Made for a much better experience than trying to go from talk to talk.
While disappointing at one level, the decision is very understandable. It's a crowded event and, given the distributed layout and lack of registration, there's no real way to put any controls in place even if they wanted to without making massive changes that would require much more staffing.
