We are. WhatsApp generated a flurry of interest around Erlang. Heroku uses it. I'm sure there are more examples.
Google is at this point already a large corporation and probably already in decline (IMO). The tools they use are optimized for interchangeability of mediocre programmers, not for high productivity from a small team. Go is a perfectly good Java 1.4.
(There's Docker using Go, but I think their whole approach is a bad idea).