I would love to be able to use D in my day job. It's a fantastic language that is both powerful and fun to work with. It's great to see companies embracing it.
My hobby project languages or choice are currently D and Kotlin. I prefer the semantics and flexibility of D, but Kotlin has the backings of the tried and tested Java ecosystem, which is hard to beat when you just want to get down to it. Also web servers in Java are vastly superior at the moment. Vert.x is so very fast.