Deception is NEVER benevolent. Don't lie to your users, people.
So I should never pretend that an operation that took 10 ms took 200ms so the users stop hammering the Save button over and over again because there's 'no way' it could have saved that quickly?
The button went back up, with no functionality, because users liked that.
Finally got rid of the button and put some text that said 'saving...' -> 'auto-saved' in its place.