I recently had to start working in a java project, forcing a change from vim to a IDE. Most of the time I'm just as produtive as I am normally with vim (in other languages, java's verbosity is why I went for eclipse). Their have however been several times where I switched over to terminal for very specific reasons, generally involving grep. I see the command line as the least common denominator for software, almost all of your computers functionality is available to you. It doesn't come up often, but when it does, it is definantly nice not having to leave just to edit text.