In the sysadmin world yes but not nearly enough. UML along with similar ones like blockdiag and nwdiag interface nicely with my documentation systems in orgmode

In the sysadmin world yes but not nearly enough. UML along with similar ones like blockdiag and nwdiag interface nicely with my documentation systems in orgmode and asciidoc. One of my side projects is an automated nwdiag mapping system with diff's to be able to help sysadmins coming in blind to orgs (happens way more than you'd think, usually a 5 yr old visio file somewhere). Anyway, in the future I see uml style things as useful for similar automation projects, due to the simple text nature. Also, I live in a terminal most of the time so personally prefer stuff like nwdiag over say visio or some of the alternatives. I also used to make repair flowcharts with seqdiag for my t1 and 2s.