> They also slow things down. This can be unacceptable for power users, who just want to "get things done". As a practical example, I can't use Apple's "spaces", because they force me to sit through an animated transition when switching between screens/workspaces/whatever. It's fun the first time, but gets really old after a hundred or so.

That's how I feel about MacOS virtual desktops.

You used to be able to configure it so that there was no animation, but they removed that options a while back.