I love the command line. If the command line were a dog, it would be a hard-headed labrador: big and somewhat intimidating, but really kind of even-tempered and friendly once she gets to know you.
I just compared the command line to my dog Roscoe. I love them both, and they both frustrate me.
I can't do much with Roscoe, but I can help out a bit with the command line. And so allow me to introduce four of my favorite utilities: df, du, file, and find.