One method I'm using for mass amounts of holes is to chuck up the deburr bit into my die grinder set to low psi. Being VERY careful not to countersink, I'm able to go hole-to-hole fairly quickly on sheetmetal, using very light pressure. A quick blip for each hole. The low psi of the grinder won't let it turn if it grabs too hard, also helping to prevent countersinking. The lightness of the die grinder (versus a drill) also helps to have a feather touch on each hole. Once I got it down I can almost do 1 hole per second along straight lines like the wing skins. This method doesn't work well on thicker parts, I've found (the bit tends to chatter.) But yes, deburring can be (is) a serious chore no matter what you do, especially on the wings.
I use one of these to chuck the bit.
http://www.panamericantool.com/1-4-stra ... -2820.htmlCan also use threaded bits and countersinks using that adapter, in any drill or grinder.