I wonder how many vim users have tried using CTRL + [ for the first time today. Muscle memory being what it is I fully expect that nobody will swap over to this new and improved Apple way of pressing the Escape key.
And vi too - works just fine, but you have a valid point about muscle memory, which is pretty much the only kind of memory many of us have left when it comes to vi-like editors, since the key sequences disappeared from our brains decades ago!
Had it only been a week or two I suspect my muscle memory wouldn't've shifted though.