Both my personal and my work laptops are OS X, but my primary home machine is vanilla Debian. When running X on it, I use the Afterstep window manager, but a lot of the time I don't bother with a GUI. (I'm a systems engineer, and old.) That machine also runs a Win7 VM that I use to run CAD software, so I guess in a twisted way my primary Linux desktop on that machine is Windows. But most of the time when not designing, the command line is just more natural to me.
My home storage server runs FreeBSD, and most of the rest of my machines end up running whatever's best for what I'm playing with - right now, four of them are Centos because until recently, RHEL-flavored distros were required for oVirt, which I'm writing some software against. But Red Hat's approach to things makes me sad in my special angry place, so I avoid it whenever possible.
At work, we run a mix of Debian, Ubuntu and Centos, and OpenBSD on select systems.
For those looking to become more proficient at the command line, I highly recommend taking the time to learn how to use `tmux`. Or `screen`, if for some reason you're stuck with that. It will confuse you at first, but then it stops being confusing, and your life at the command line will be vastly improved.