Everyone talking about Docker as the next big step in productivity. I still miss why Docker is so useful, to be honest, I see it as a "micro-vm " running your own software.

I have used this technology before but I really struggle to see where I could apply it usefully.

At this point, I'm thinking I'm just too naive about the issues it solves. So lemme go straight to the point:

1. How does Docker speed up your productivity?
2. How do you use it?