I went to Goshen a few years ago for my first timber framing workshop. They have a good bunch of guys and I learned a lot. The focus at Goshen was more on use of power tools and mill rule layout. We cut timbers for various Goshen projects and did not raise a frame, although we did visit a couple of locally raised frames.
For my second workshop I attended a course at Hancock Shaker Village conducted by Jack Sobon and Dave Carlon. These guys are master timber framers, the focus was on hand tools, traditional timber framing, square rule layout, and we raised our frame at the end of the week. This workshop was more expensive but well worth it in my opinion.
I have not been to Cowee, perhaps others can comment on their workshops.
There are other good options as well, including the TFG workshops at Heartwood or at Pinegree Park, or at a TFG conference or event.