I learned this from an awesome electrician I worked with who did nearly all of his work with paddle bits and a cordless drill. He would have the drill set on the highest torque screw clutch setting, which let him drill wood, but if the bit hit a nail it would stop instead of beat itself to dull. I use this technique a lot still, but my Makita 18V (not the big hammer drill, the smaller one that comes with the big kit) doesn't have a tight enough torque setting to use bigger bits. My old Dewalt was perfect.
He also taught me to resharpen spade bits with a grinder. Any day he was on a prewire, the first thing he and his helper did was pull out a grinder and the bits and touch up any that needed it. A fresh sharp spade bit is FAST.
I've all but moved completely away from the big augers, they just beat you up. If I have to make a big, deep hole, I use a
Milwaukee Switchblade self feed bit on a D handle right angle drill. If it's framing two-by, I use a hole saw on a corded Milwaukee hole shooter magnum drill (stalling the bit on cordless eats the battery VERY fast and isn't good for the battery or drill, they get super hot).