Actually, I have found a need to do that. The OS X GUI has very simple and effective power management, in fact I loved the UPS automatically being a part of it when I plugged it in, instead of having to install drivers and programs. But what's underneath is much more configurable. I wanted to do some power management a bit more fine-grained, so I had to drop to Terminal and use pmset.
That’s true, but you didn’t NEED to drop into terminal. There are configuration options I set via command lines, but you don’t NEED to do them.
There’s plenty of times you NEED to go mess with regedit on Windows (eg, getting rid of viruses). The first time I have to help someone over the phone get into regedit to recover their machine... you can always hear the fear in their voice when they open that puppy up.
“Am I going to hurt my computer doing this?”
“Yes, unless you do EXACTLY as I tell you...”
“Oh....” (and the whimpering begins...)