25-strong dev team using C# 6 right now. Painless upgrade apart from a few pieces of legacy tooling. Some patterns haven't really been adopted much (e.g. exception filters). C# 7 looks like more of a leap but there's always an appetite to stay current in our team and I'm sure we'll take the plunge.

How many friends, both close and casual, do you have? How many family members? For me, that number is around 150. Facebook enables me to ping them occasionally, or just passively stay in touch with their lives, where maintaining that many face to face friends is not practical.