simple tip

I mill thousands of herbs a week into pigments. Clicking 'mill' and then choosing a stack in my bags to mill, and then looting the products, is not an option. So I made a macro I use for it.

/cast Milling
/use Adder's Tongue
/use Icethorn
/use Lichbloom
/use Tiger Lily
/use Deadnettle
/use Talandra's Rose
/use Goldclover
/use Fire Leaf

I also have auto-look enabled. Of course, this is only for Northrend herbs. Also, if you have partial stacks of herbs sitting in your bags it can cause the macro to not work properly. Just remove any leftovers (bank them). Bag doesn't even have to be open for it to work.