I learned so much from last year's conference and got to meet and know many of the movers and shakers in the company and industry. I was pretty impressed with the Convergence video too. I recommend that you view it and see if it doesn't outline the salient reasons to go to this conference.
I will be speaking at least once. I will also be in the community lounge every day and I am coming early for the pre-conference and MVP sessions. Give me a shout out if you want to meet up to talk. And maybe, just maybe I'll bring one of my saxes. :o)