Right now I use it for demos... We use a stack that is little complex for someone wanting a quick taste. So provided they have a modern Linux with with docker installed they can quickly do a self demo.

And if they don't, well having a fresh image that is easily rebuildable makes it easier for me to give demos than to spin fresh VMs. Arguably I could have done the same with Vagrant, but really didn't need the overhead of the VM.

But for using it in deployment, no.