Queueing units is a very good feature when you alredy have a standing army and only need a few troops to fill the gaps after a battle. That way you don't have to worry about running out of living places or food. You can just hold shift and click unit card a few times and you get just enough soldiers you need.
Many times have I found myself under attack while I was reinforcing my depleted units. And while I was fending off the enemy attack I completely forgot my barracks was creating soldiers. So I found myself with hundreds of troops that I didn't need.Added (29/March/2013, 8:40 PM)
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If someone can figure out where and how to enable queueing in BfE (as it is in NW) it would be greatly appreciated.