But I don't want to disable all animations, just this one.
More to the point, I should be able to pick and choose which animations I want, install my own or 3rd party ones, etc, ie as far as possible, my computer should be controlled by me, not Apple.
defaults write com.apple.finder DisableAllAnimations -bool true
defaults write com.apple.dock launchanim -bool false
defaults write -g NSWindowResizeTime -float 0.001
defaults write com.apple.dock expose-animation-duration -float 0.1
defaults write com.apple.dock autohide-time-modifier -float 0
defaults write com.apple.mail DisableReplyAnimations -bool true
etc. Look it up.