I'd say one of the biggest things for me was a sense of how expansive God's love is, for me and for others. Before starting the program, I was honestly worried that I didn't have room in my heart for all of these new people. Of course, I did, and for so many more that I met through SotS, directly and indirectly.
I think being a part of the class/community softened me. There were several times over the course of those two years where I would see someone do something thoughtless, and then turn around and be a clear channel for God's love. I came to see how everyone is a mixed bag---myself included---and God loves us all anyway.
I also learned how much support I need for ministry. That was hard for me because I like to think of myself as independent and self-sufficient, but I really need a lot of support. My care committees, my k-group, my class, and the two meetings I was a part of were all anchors for my ministry over those two years.