Solaris was MY first hands-on exposure to Unix. I was born in 1967, and until 1998, I had been programming, much of which for aerospace R & D, where we simply abstracted away both OS and hardware. So, at 31, I was sitting there, looking at the blinking bar in a ksh shell [bash was not available until later versions of Solaris]. I had just sunk more than a month's worth of pay into an HP server with TWO processors - the thing was considered a powerful beast, and trumped by far all machines any of my colleague programmers had at home.
So there I sat, typing away my first awks and seds, learning emacs and vi. I could bring up Solaris' baked-in firewall with a single command. The feeling of raw power at my fingertips was... amazing.
Nowadays, I use Linux. The only GUI I need is the one on the laptop I use for internet access. There are six other computers here at home, where I work. They run a Jenkins compile / build farm, and an OpenStack private cloud.
All configured and brought up and maintained by command line.
The love story goes on, and on, and on !