I have level 3 barns and spend about 1-2 hours every week or so trapping wolves in Nagrand. Takes 10 minutes on my hunters, 15 on my DPS casters, 20 on my paladins, and 35 on my druids to get ~75 traps done. Once that's done, turn in 36 work orders at the barn for fur, come back 5 days later to collect. Mail the sumptuous fur and savage blood to my AH alt and keep it listed. My server is low population, so the fur sells quick at ~480 a stack of 200 and the blood takes forever, but usually sells for ~3800 a stack of 50.

Outside of the above, I just park everyone at the table in the main garrison building. With the masterplan addon, I just sort by reward type, broadcast-right-click everyone until they're full and click "Send tentative parties." Takes all of 60 seconds per group to collect and reassign everyone, so max of like 5 minutes of actual work per day total on missions. Once a month or so, I'll go clean out all the crates and bags and upgrade followers.

My AH mule is sitting on something like 850k gold, and I didn't even have a barn until 2 months ago.

Frankly, I spend most of my actual game time helping family and farting around in Tanaan or instances. I.e. NOT in garrison junk.