I did. It felt so self-righteous. A close friend was DFd when I was in my late teens. I recall she worked at the place where I took lessons. I had to interact with her one time. She apologized and we both felt very uncomfortable.
When I became an adult, after some very dear people close to me were DFd, I realized I didn't want to do it anymore. I still avoided any overt confrontation, but it broke my heart not being able to interact with them closely anymore. I had gone to "serve where the need is great" and one of the local elders I loved very much was DFd. I didn't realize it at the time, but it was for apostasy. Those same elders that DFd him had treated me horribly, too.
After I got back home I stopped shunning. In fact, I openly welcomed a DFd friend to the hall and hugged her and spoke to her in front of the rest if the congregation, told her how happy I was to see her. My actions were instrumental in her returning - which I now feel rather ambivalent about. It ended her shunning, but it also brought her back into the cult. Funny, I had completely forgotten all of that until just now.
When I myself was DFd, I realized how important those small kindnesses were. I know I avoided people's eyes when I was DF'd. It was for two reasons. I didn't want to see the scorn in their eyes or have them turn away, and I wanted to make it easy for them because I felt so guilty. One meeting the only empty chair was next to a former piano student of mine. Through the whole meeting I could feel how tense she was sitting next to me and I just wanted to die.
The only thing that kept me going and saved my life was that after a year of hell had passed, my pioneer aunt and then my mom both decided they had enough of the elders games and stopped shunning me. They stayed by my side at the convention and supported my efforts to return.