Similar to several others above, I used to think the same way...until my brother in law opened my eyes on a couple sheep and goat hunts in Alaska. Now I don't go anywhere without them in steep, rocky terrain...especially when hauling hefty loads. It's no wonder animals with 4 legs do so well! I don't see any need for them hunting antelope in the prairie but for hunting steep, rough terrain I don't leave home without them!
With that said, the downside to poles is how noisy they are "clanging" on rocks. I'm a little hesitant to use them while stalking in rocky terrain in fear of spooking game. There also is a pretty hefty learning curve on how to use poles correctly. There is somewhat of a science to using the straps properly, having each pole adjusted to the correct length, planting poles at the correct time between steps, etc.
If you are skeptical about trekking poles you own it to your body to give it a try...especially in steep, rocky terrain! Your legs will thank you!