Over at lesscode.org (Bill Gates: less code is only metric [@lesscode.org]), finally, a comment from Bill Gates I wholeheartedly agree.
There’s only really one metric to me for future software development, which is — do you write less code to get the same thing done?
Indeed. Just as the measure for efficiency in engines is how much work can it do given a certain amount of energy, the measure of efficiency for a software tool is how much can the user do given a certain amount of energy.
Oh, about me agreeing with Gates: Hell must have frozen over.