does professional devops (server administrator) use webmin to manage their server ?
or is it only for unprofessional linux users ?
and is it only for ubuntu(.deb), fedora/redhat(.rpm) ?
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Webmin can be a handy way to provide a front-end to Linux/Unix tools for inexperienced users (or people looking for a centralized administration interface). I've installed it in cases where I needed to delegate responsibilities to a client or end-user of the system.
An appropriate example would be restarting a daemon or using Webmin to help configure users/groups, printing or Samba shares.
As a professional engineer, I don't use it, but it has its place.