Speaking personally, I've been a professional developer for almost decade and even in my relatively short career I've seen a lot of technologies come and go. I was reluctantly roped into it by my first boss, an enthusiastic Vim advocate. And since, almost nothing else (save for maybe git) beat learning vim from a return on investment perspective. From the default mac OS installation to some old Fedora box that has no…
Fun story: I was into Free/Libre software as a teen, when I learnt how to move around in vi(m) and in my first tech gig (as a sysadmin), I was interviewed by some greybeard who wanted me to do some maintenance and configuration tasks. I knew the basics of command line environments, but I had never setup LDAP, mail or DNS. So anyway he asked me to setup some repository on yum, and well, at least I knew how to do that. When he saw me using vi commands to quickly edit the file, he stopped the interview, arguing that anybody who was fluent on vi, was obviously a seasoned admin and I got the postion. I never had the guts to tell him otherwise.