I experienced shunning for about a year and a half after I was DFed before I moved away. I was initially removed as a full time pioneer before I was DFed so there was some shunning before I was DFed.
I'm not sure what exactly hit me so hard about reading those scriptures. In context of the paragraph in COC, these are listed in reference to disfellowshipped ones and their family members who shun them. For me, what I think happened is I realized just how wrong the disfellowshipping practice is. I remembered the parable? about the shepherd who has 100 sheep, one wanders off, he leaves the 99 to rescue the one. I was the one.