Some of us do, when appropriate.

Docker took a technology known to many that setup/admin/manage machines, added some fluff, made things simpler, and marketed the idea.

In a crowd that might spend more time thinking about nodejs and callbacks vs promises or how easily one can tip a rails app up on heroku, existing systems tools for things like jails/virtualization may either be over looked or not a concern.

For every docker, there are people (of which I may be one) that think , "big deal, it is just x". Meanwhile that thing is getting traction and popularity. It might not last, but it is around and making noise now.