Agreed. Docker (actually, containers in general but docker tooling) made it so damn easy to get local, reproducible builds. It’s fantastic and made life so much easier for me professionally as a Software Engineer.

I remember the early days when Docker had just released, all devs were super excited but nobody had run containers “in production”. AFAIK I believe it was mesos that was used widely for orchestrating containers in production. Docker swarm/compose just took too long to get there and k8s just rapidly took over and became the standard.