Docker's hype train was absolutely absurd, but it was instrumental in making containers ubiquitous, and the wrapper is the reason why. Containers were painful as hell to set up and use; it was like using Git, but worse. Docker made it convenient, simple, and useful. By now everybody understands that immutable artifacts and simple configuration formats are extremely effective. Docker is one of the only tools I can think of that was designed with a human being in mind rather than a machine.