>>That's one of my absolute favourite things about Mac OS

Mine too, but I'm on Windows where none of this work out of the box. However, I've found XKeymacs [0] which allows Emacs keys system wide. It is not fool proof, but I've found that the movement keys can be used without much trouble.

Currently I use:

Movement:

C-b C-f backward/forward-char

M-b M-f backward/forward-word

C-p C-n previous/next-line

C-a C-e Home End

C-x h

Capitalisation:

M-l M-c downcase-word, capitalise-word

M-F12 rollup-window

C-z iconify-deiconify-frame

C-q enable-disable xkeymacs

[0] https://github.com/fujieda/xkeymacs http://xkeymacs.osdn.jp/

I also use TouchCursor [1] to get vim like hjkl movement system wide while Space is pressed

[1] https://martin-stone.github.io/touchcursor/overview.html