For me, it's less about the ease of starting one thing than it is the ease of juggling a lot of things. I've got docker containers on my machine for multiple work projects and a few organizations I do volunteer dev work for. Between them, I'm running two versions each of Ruby and Python and a number of instances of Postgres and MySQL, plus local Redis containers for three separate projects. Shifting between them is as simple as docker-compose down/cd/docker-compose up. When I'm done developing for the day, I just take everything down and bring it back the next morning.
