Quite frankly I won't miss large, overpriced, junket confs like O'Reilly's. They were too expensive for most people to justify attending without corporate sponsorship. The expo halls were full of enterprise sales pitches with minimal substance. They also had sponsored keynotes which tended to be sales pitches. If you go to meet people instead of selling your product go to smaller confs put on by local organizers.
Both times I came back with a handful of tidbits that would have saved either myself or an entire team weeks of frustrating debugging or research work. So yeah, you got your money's worth.