It's required by law here, but if it wasn't required I'd still wear it.
You can spot orange a long ways. Since no critters I know of wear orange, hunters would assume it was another hunter.
When hunting horse back, my horses look like Christmas trees. I carry a seperat vest plus a roll of orange tape for any game I may be packing.
CPT USAR Ret
USAMU Sniper School Oct '78
Distinguished Rifle Badge 1071