Smokescreen and shadewalker are great if you use them properly particularly if you run with friends and can co-ordinate. Shadewalker means your tank can spend more time out of tank stance so they deal more damage without having to worry about losing enmity. Smokescreen means you can prevent the healer or a strong dps from catching up on enmity. They're both oGCD skills so using them doesn't even take away from your dps, it's pure benefit.

Hyoton is for pvp to stop mages and ranged from running away from you.

Just because you don't do content where skills are useful doesn't make them not useful.