I have a big pile of leaves that I'm leaving for leaf mold to use on the beds.
It was once a mountain, but is only about 3' tall now. I've read it takes about 3 years to develop a good crumbly leaf mold at the base, so I have one more to go. I don't shred them, if I did it would break down much faster of course, but I'm willing to wait and just let it do it's thing. I can keep adding to the top and just steal from the bottom when it's ready.
I get more leaves than I can use from jobs, so now I'm stopping at neighbors on the way home and giving them truckfuls to use in their gardens.
*On the negative side, when I was reading up on the cure for potato scab, I ran across a comment on a university site that dry leaves can contribute to scab on spuds. That made sense as that garden area got piled deep with unshredded leaves last fall, then turned under this spring. The leaves had not broken down appreciably when I planted.
Then the dry spring and summer and a few other factors made the perfect storm for my crop failure.
EDIT!
* Wrong fallen leaves! They were talking about fallen potato leaves that have the streptomyces scabies present on them. Ooops!