Docker is immensely useful when starting projects that use web services because it lets developer download and run instances of any service on demand with a single CLI command, and lets any teammember do the same with your work.

Then with docker-compose you are able to instantiate custom deployments of your projects, including dbms and gateways and messa buses and IAM services, with a single command (docker-compose up).

So yes, it's very useful.

However, the point of the article is that Docker is no longer the only option, and although right now it's the default go-to container tool, there is nothing but inertia keeping the world using Docker.