I've never actually used Docker in production, I have some reasonable experience with Chef, a bit with Vagrant, and many years of my own ad-hoc configuration an

I've never actually used Docker in production, I have some reasonable experience with Chef, a bit with Vagrant, and many years of my own ad-hoc configuration and shell scripts. The reason I say this is so you don't immediately dismiss what I'm about to say on the basis of kool-aid consumption. Aren't additional environment like staging exactly the place where Docker gives you marginal gains?