Where I am now, I mostly don't have enough to worry about. My naturalized wooded hillside with native wildflowers, I just leave the leaves.
Where I used to live we had a couple acres of lawn with some big old trees that dropped tons of leaves. Raking was turning into a huge chore, and as James noted, there were enough leaves and leaves were large, the lawn would be smothered if we just left them there. So we went over them with the lawn mower to chop them up in tiny pieces which could break down. Just raked what I needed for mulching the garden and for compost.