For those that don't use it, you can use the old commands that have been available since 10.4 to disabled it.
or to re-enabled:
Now when you scroll to the left on the first Space, there's nothing there, it completely disappears from Mission Control too!
Code:
defaults write com.apple.dashboard mcx-disabled -boolean YES
kilall Dock
or to re-enabled:
Code:
defaults write com.apple.dashboard mcx-disabled -boolean NO
kilall Dock
Now when you scroll to the left on the first Space, there's nothing there, it completely disappears from Mission Control too!