I used it in production with CoreOS and now Kubernetes. I almost never touch the Docker CLI and haven't tried Swarm. I think a lot of developers mistakenly think they can get to a production environment in a few Docker commands which is definitely not possible today.
Yes, in an absolutely ideal world no one ever should touch a production environment, and ideally in every situation you find yourself having to touch a production system you should then be creating at the very least a backlog item to figure out how to avoid doing it in the future, but the reality is some kinds of troubleshooting are hard to do without having access. Generally the kinds of situations where you need that access are ones when you want access the quickest and easiest, i.e. the world is burning somehow.
OP wasn't talking about access, but about the effort needed to set up ("get to") a production environment. Of course Kubernetes/Docker gives you full access to your production environment.
