I use 'just blowers' and it does take a while. I refuse to mow over leaves, and most of the cleanups I do are in the city where they pick the leaves up off the street. You just have to charge accordingly. Or get a wb blower.
We do all our houses with blowers, we usually run a couple push blowers and a couple backpacks and use the mowers to push the piles. Then we vac it up into the truck and clean up with the ultra vac. The houses we do are pretty big, most are 1-2 acres but there are about a dozen or so houses that are 3-6 acres. I couldn't imagine trying to vac them all up with the mowers you'd be there forever.