Ofcourse, tons of "enterprises", ING, Comcast, Salesforce, IBM, General Electric, Electronic Arts, (Slack?) and Google (obviously).
There are also tons of components to pick from, someone is obviously building them. We are rewriting parts of RhodeCode UI in polymer right now and everyone is very happy about how that goes.
There are plenty of job offerings on polymer job channel and in the wild.
It just seems that HN folks are ignoring anything that is not called Angular/React because its not hyped enough :)
Youtube Gaming, Google Play Music and IBM's Bluemix are probably the biggest projects built using Polymer. The main Youtube website itself also seemed to be playing around with Polymer.
