CLI lovers may be welcome, but do they actually use it? Everybody I know who said that OS X was great because of the CLI has since switched to Linux.
Did these people switch from Windows to OS X? OS X happens to have a usable UNIX userland, which is good, but what makes it great is the combination of being a UNIX and the excellent GUI, commercial software availability and support, and no hassle with wifi / power management / multi-monitor support.
I'm a long time UNIX user (started using various proprietary UNIXes a few years before Linux existed) and a software developer. Of course I use the command line (BTW homebrew being my package manager of choice). I also use Microsoft Office, iTunes, commercial music apps (like Logic, GarageBand), commercial video editing software (Final Cut). I switched from Linux as my host OS (running Windows in VMWare), to OS X as my host OS (and needing a Windows VM a lot less; I don't use Windows at home at all anymore). OS X hits a sweet spot where it meets all of my needs, one of which happens to be a proper UNIX userland, even though Linux is better for that. It's the sum of the parts which is what makes OS X and Mac hardware nice.