I’m still cleaning up my emacs configuration. I stumbled across the configuration I did to enable the narrow-to-region command, and figuring that the "disabled" commands are likely to be pretty interesting, wondered "What other commands are ‘disabled’?" There’s no list that I could find online, but you can find out for yourself with a little lisp:
(mapatoms (lambda (x) (when (get x 'disabled) (message "disabled: %s" x))))
On my machine, this produces the list:
disabled: erase-buffer disabled: set-goal-column disabled: narrow-to-page disabled: upcase-region disabled: narrow-to-defun disabled: scroll-left disabled: Info-edit disabled: dired-find-alternate-file disabled: downcase-region
… as well as, of course, narrow-to-region, which I de-disabled myself.