On a very much smaller scale I gather leaves for mulch in the garden. My neighbor has long needled pines along the edge of his yard. I had him blow leaves from other trees into windrows, but he also blew the pine needles into a windrow. I used my lawn-vac with a 12' remote hose and handle to pick them up. It has enough suction that it picks them right up.
I also have another one that connects to the mower deck on a dedicated Cub Cadet, on that one seems the needles get packed in the boot at the discharge and will plug if you go too fast. The remote hose works best. I bought both Agi-Fab lawn-vacs at Spring consignment auctions for pennies on the dollar and both work very well. Gave $135 for one, $140 for the other. Just some food for thought. This is a picture of the $140 one. Remote hose kit is around $115.00 well worth the money the labor it saves.