I can see why, for flavor, you might not want these to be instantaneous. But a bit faster would be appreciated.
Yesterday I was doing Relic of a Sovereign Past with my cleric. In a lot of quests (I solo a lot) I will buy a rogue hireling for the trap bonus. For Relic, even though I got 31,000+ XP and the trap bonus would have been fairly large, I didn't bother with a rogue.
My usual strategy in a group, with a PC rogue or arty, is to run through all the poison traps on the way to the last room. By the time you're done killing everything in the corridor and done killing the last two blackguards and talking to the boss, the party's trapper is done disabling all the traps in the corridor.
With a hireling rogue, I would have had to spend a LOT of time in the last corridor, pausing to search and then pausing to disable all of those traps.
When I'm on my rogue, I always think it would make sense if at epic levels, even with more difficult (i.e. - higher DC) locks and traps, he would be a bit faster than a level 1 rogue. Epic rogues who kept Spot, Search, DD, and Open Lock maxed should be absolute masters of their craft. Perhaps after a certain skill level the trap box automatically appears once you Spot it, and the DD animation gets reduced incrementally until, at level 20, it is just a hair longer than instantaneous.
Just an idea...