I actually regret upgrading at this point mainly because of Mission Control. 2d spaces and painfully slow switch-screen animations has hurt my productivity.
defaults write com.apple.dock workspaces-swoosh-animation-off -bool YES && killall Dock
If anyone knows how to do the same under Mission Control please, please do tell. defaults read
EDIT: Hmm, that shows all of the defaults that are currently in the system, but I guess doesn't show you what extra settings you could set. E.g. that setting in the grandparent doesn't show up in my defaults.