Saving and Quiting in Vim (shortcut Method)

Normal way to save and quit a file in vim is using :wq in vim. This is used by most of the user, but this involves three different keystrokes. But there is another way to do this saving and quiting. Just press ZZ in the normal mode and the file will be written and then vim will exit. I personally think that this is more efficient because it involves only one keystroke and it does all the things. Hope you also find this way of saving and quiting easier.