A different aspect to traps: Rewarding the player if he manages to detect and not activate them.
It's incredibly fun to lure enemies into traps you have not triggered!
I do this whenever I can. In Oblivion and Skyrim, where traps are generally very weak, I would always take my time and lure enemies into them, knowing it would be much easier to just smash their head with my axe. It adds a certain aspect of slyness and Schadenfreude.
I like traps in Fallout because if you see and recognize them before tripping them, and you have a high enough Repair skill to defuse them, you get rewarded with a small bit of XP and, depending on the trap, some ammo or an explosive. To that end, I always feel like I lose out when I miss a trap not because now I have two broken feet, but because I WANTED that land mine. I can heal my feet, but that mine is gone forever.