TO THE ANAL RETENTIVE LEAF-RAKERS:
Leave them be.
They feed the lawn and insulate the perennial beds. Let Ma Nature do her stuff. Unless you're stuffing a goblin, let 'em lay. Trust me, Ma will tend to them.
And, if you have a leaf-blower, you're beyond redemption. Nothing fruitlessly funnier than watching someone blow leaves on a windy day.