I am in the same mode as you, thinking about going. Have you been to one of these before and, if so, was it of any value?
I am actually going and doing one of the sourcing presentations. I'll be there 1-5th as well (unless of course by some fleeting chance my Eagles make the SuperBowl). I'm wondering what their turnout will be since we seem to be getting frequent emails from them on siging up. My session is running twice but I was glad they arranged it so I can attend some of the hands on Bullhorn led seminars. I too have been using it a little over a year and know I am not using it to it's full potential. Over the holidays I started changing my field mappings and reading what has been implemented off of Brainstorm.
I just got an email from them this morning that they are having a short seminar on the 21st at 2pm est to go over Bullhorn 360, the conference and some of the new tools. If you did not get the email I'd give them a call.