Well - my knee-jerk reaction is "Everything!"
A slightly more useful answer could run along the lines of:
Footwork: so you can dance better, more efficiently, faster, more smoothly, get extra 'tools' for musical interpretation, improve your lead / follow / connection, and to get more out your dancing, and enjoy it more. To name but a few things.
Lead .... you actually have to ask? A few examples: connect better with your partner. Learn to lead more movements, with more subtlety or speed or gentleness... which will let you get more out of your dancing and enjoy it more.
Posture: Good posture will also improve your connection, your balance, your ability to move, and perhaps most importantly, it will help you avoid back problems and other related issues which bad posture can bring about. One consequence of all these is to help you get more out of your dancing, and enjoy it more. Sensing a subtle common thread here?
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