Several people have mentioned things/ways to address this discrepancy from the other end... speeding up the search animation, auto detect on a spot significantly over the search difficulty of the door, etc. All very good ideas. On that line, auto-rolling a search on a successful spot, sans animation, might be a good way to go. Heck, maybe make it a free feat for rogues/rangers (say level 4/8) to auto-search on successful spot. All of that would be fine for pumping up the detectors to match the clickie/spell/wand users. Additionally, it would be more in line with the speed of the game than what I suggested.
Re: the spell, though... it has been suggested that it is working properly. That isn't the case. Using detect secret doors it is supposed to take you at least three rounds to figure out how to open a secret door. Initially you are supposed to be able to identify the existence of secret doors in the direction you are facing... while standing still and concentrating. During the second round you can identify the location of each secret door, again, in the direction you are facing only. Not until the third round of continued concentration can you figure out how to actually *open* the door. And even then, only 1 door per round. So, based on the 3.5 description I can find, the DDO interpretation is *significantly* more effective than its source material. While I have no huge urge to turn up the speed of the game any more than it already is, I certainly wouldn't want to slow it down that much.
What I originally suggested was with a desire to avoid pumping up one thing to compensate for another thing that is too powerful... and largely a reaction to the game continuing to get easier and easier. Probably not the way to go though.