My club is outdoors, and hosts multiple matches a month - plus unrestricted access to members anytime there isn't a match going on or the facility isn't rented out. The ground is grass and dirt, no gravel. Mainly pistol brass, and .22lr comes out during the sorting process so it's no big deal if I pick it up.
I'd love to hear what tools you use to speed up the process of picking up brass. Hovering over like a hunchback and getting a piece every now and then is a pain during the week, and at matches we try to get the place cleaned up asap. This is the step of brass 'processing' that takes the most amount of time for me - the tumbler is on a timer and runs at night. I took the trick from fast/friendly brass and hook up a 5 gallon bucket with plates to my tumbler, and that does a good job of doing a 'good enough' sort.
This'll be used to get the aluminum junk everyone leaves behind as well, because let's face it - it makes the place look like nobody cares about it with casings all over the place.