Leaf mould is not particularly nutritious but it's crumbly texture will help loosen your soil to move it closer to that illusive "friable" state. It also provides a perfect habitat for beneficial soil life like earthworms and fungi. It is extremely moisture retentive, making a great mulch. If added to the compost heap, it brings good levels of carbon helping achieve that perfect carbon:nitrogen ratio which can be difficult to perfect with the usual high levels of nitrogen in most plant life.
Make it. You've no excuse.