The leaves do get packed but if you have help it doesn't matter too much. My brother and I always have two people feeding the loader whether the pile is loose or packed so it does not slow down our operation at all. The only time the leaf plow has slowed me down was when I was testing to see if I could move an acres worth of leaves with it. The ZTR pushed them but they were packed extremely tight. Idk if you have a welder but I'd recommend making your own because for the price of a mount and leaf plow you could buy a welder and the metal for several leaf plows.
Here is a link my thread in the pictures section which has a video of my plow in action. That pile would have literally taken hours to move with just blowers.