No, there aren't any poetry workshops as good as Eratosphere, Cameron. But I
would say that, wouldn't I?
But seriously, I know of plenty of other crappy sites that I wouldn't go near! How much time do you have on your hands, I'm wondering, if you want to join other sites. (Quality, not quantity?) It's good to build up a relationship with the lovely people here - honestly, I have made a lot of really great friends on both sides of The Pond, through being a member here.
But others may know of places you could try... forgive my light-hearted treatment of your question.
Jayne