In the upfront of currently technological changes we saw Docker as a new optimization paradigm. Why we waited so long to adopt it? The answer is simple, we only need it now, we were in a very long stable development process, without needing to migrate server or change process development.
But recently we reached a point to make an intermediate server, a kind of homolog/backup of production, then we saw that task would be huge time consuming, make all configuration, clone of git repos, installation of services like apache, myql, wordpress, etc. So I had two options, go folder to folder and make sure everything was alright, or format and install docker in a fresh linux /docker environment.
I choosed the second and most challenge option, so now I am working in the complete migration of all our projects, sites and operations to Docker technology. After that, we could instantiate our homolog server by simple running a docker command to set everything up and running.
Docker is not hard to understand, but you need to be very experienced to understand all its power, and it is not the best solution for all scenarios, but after you start using it, will be very difficulty to step back.