All of the command-line apps I depend on either use GNU readline (which has flawless emacs style editing) or can be hacked to do so with the rlwrap utility. Furthermore since many of the NeXTSTEP hackers were also emacs users, OSX text input widgets inherited very solid (although the kill ring is lacking) keyboard binding support which makes it possible for me to comfortably emacs-style edit in native OSX apps.
Sometimes though stupid rich text input boxes used by wikis can annoyingly rebind emacs keys, and then I fly into a fit of rage like the author described. Luckily there is 'It's all text!' under Firefox or 'Edit with Emacs' on Chrome that lets you use an external editor to edit the contents of any web text widget, which I use to do all my wiki editing.