Joe4evr

Keep in mind, this is only a preview, and they're working hard to get all those languages to IntelliSense/Refactoring level. And once their extensibility framework is finalized, you can add support for whatever language you want.

Supergiant Games (Bastion and Transistor) and Squad (Kerbal Space Program), to name a couple. And all the StackExchange sites are made on ASP.NET, if you want to count that too.