Yes. Emacs is a library for writing text editors, and this library also comes with a text editor that runs when you type "emacs".

Programs are much easier to write than config files.

(Incidentally, emacs can be set up to act like vi with all of Emacs' editing commands available. To preempt the inevitable "it's not vim" comments, I'll point out that this tends to confuse vim users, who think that all "vi"s have the same commands that vim does...)