Traps were a pain in the ass, but discovering them is routinely trivial at high levels. So they are too easily "avoided". If you want to keep the trap "discoverable", one "fix" might be to NOT describe the trap in game terms at all. The PCs will discover something, but have to spend time actually investigating it to discover how to disable/avoid it. In that period of time the DM can still spring the encounter.
Traps should probably not be a lone encounter situation. That way is simply too easy. They should be mixed in with an occurring encounter.
@Frylock does frequent these boards on occassion. I hope he drops by and comments on it. He did spend an inordinate amount of time trying to kill our characters with his system, and it was quite fun.
So it seems I will only use traps to enhance encounters. In the material it seems to indicate that the DC's for finding the traps were increased? Is that true, and if so, by how much. That wasn't clear to me.