Honestly curious - why do people live mostly in their terminal? Is it a productivity thing?
For me the terminal is mostly used for these things:
1) A stable/reproducible Linux environment in which to test and run code.
2) A place to use UNIX tools to quickly do things that would take a long time, or maybe not be possible, in my (fairly large) collection of GUI apps. In particular one-off searching and manipulation of text files, log streams, etc.
Plus if I want to make small edits to a file, I can do this faster in vim than in TextMate or Sublime. And I sometimes run apps like "calc" in my terminal out of habit. YMMV on that kind of stuff, but for the two reasons above, if you are a developer of server software then this is much of your life.
I prefer to use GUI apps for some things, but I totally get it that others don't. Once you're at home in the terminal, it's tempting to want everything to live there. But if you're like me and prefer a GUI client for source control, you can easily have both!