[Bungleau]

But if you've got GM perception, shouldn't you have someone in the party who can open a chest decently? And shouldn't you be able to see the trigger squares to avoid setting off unnecessary traps (not that there are any necessary ones)?

I still think it's largely a useless skill. I'd rather apply the points elsewhere. But to each his own... I've also never had a character get GM perception, and my opinion might change if I did.