Kibitzer, you might want to email Tony, tell him you're considering the workshop, and ask how much you'll be able to get out of it using something other than Adobe Audition. 
In general, (and if it's not contingent on Adobe Audition), I'd say it looks worthwhile. There's a lot of experience, there and I imagine there's a lot to learn from some of the people involved (love to hear the Santoro block, esp.)