How to Use the Official Docker WordPress Image
For the CLI (command line) / terminal averse mac users have Kitematic. Use it to start and stop docker machine. It also shows you the available images stored in the docker repository.
The whole point of Docker for me was fast performance on my laptop for Wordpress testing. YB tested how fast files sync'ed between the Mac and the container running in Virtual box:
A productive development environment with Docker on OS X
1st class citizen on Linux a little less so on OS X. But still pretty awesome! Docker's excellent documentation has a nice diagram making that concept clear.