I never had any problems with the 'strength' of the Yankee drivers. Yet, you're not going to be rid of ordinary drivers!
The biggest drawback is their length. The shortest version - the one with the plastic bit-storing handle - I found to be of little use. The others are too long to fit in many places. You also, as mentioned, need to line yourself up behind them ... this limits their uses in stud bays, between rafters, etc.
They work best when the screw needs to be driven some distance; I'm not sure how well they'd work in attaching wires to devices.
Naturally, the Yankee drivers make lousy knock-out punches, rotten chisels, and terrible pry bars. One CAN bend the drive shaft.
If you're doing that many high-torque jobs .... maybe you need to try one of those cordless impact drivers. I've been using one on the current job, and am most enthusiastic. Use one once, and you'll never reach for the drill/driver/screwgun again.
