Secret doors. Almost every dungeon has them. I simply detest them.
It was recently asked why there were no mechanics for secret doors in Swords & Wizardry Light / Continual Light and the simple answer is it never even occurred to me. That is how much I dislike them. It wasn't even a conscious omission ;)
I find secret doors to be an overused obstacle. Just how many does a single dungeon level need?
My problem with secret doors is that they are a potential show stopper that even with good play from your players, the dice can decide the door is never found. What lies behind? For all intents and purposes it never existed if the dice decide it was never found
Concealed doors? Now THAT is something I can get behind. Look behind that armoire. Why are there curtains on this wall? What's under this rug? Good play will reveal with concealed doors what dice may otherwise steal with secret doors.
Besides, I never understood elves uncanny ability to see secret doors when others can't...
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