Earlier quoted context omitted.
It's a hammer problem. Docker is the new hammer and now everything starts to look like nails.
Luckily, a lot of the things are nails. The number of applications you can keep neat and tidy with a fleet of containers is so great. Even a relative novice can get some great things working by poking about a few guides. And when it all breaks you can start again without too much collateral damage.
Maybe I'm too old to get the appeal of "a fleet of containers" in place of a single (and potentially throw-away) VM image along with maybe even a vagrant-script to make it easily reproducible... ¯\_(ツ)_/¯