To elaborate on what others have said (editors), Emacs' auto-indentation of lisp is _phenomenal_, even if you're not using "paredit". You basically can press t

To elaborate on what others have said (editors), Emacs' auto-indentation of lisp is _phenomenal_, even if you're not using "paredit". You basically can press tab on any line, and it will be indented to the Right Place. It quickly gets relatively easy to correlate indentation depth to how many parens you need to close your s-expression.