Players have their natural instinct to gauge where traps are. Basically base designers can utilize this to its best. Designers will know potentially where the traps are by giving enough time to analyze the base.
Weaker players can attack high-number players in clan wars, with the sole purpose of finding traps/tesla locations, so other players trying to attack the base for actual stars don't have to worry about them.
However, in a top war clan, every attack matters and this will be a poor tradeoff of resources.
Spamming of this spell is not recommended since it reveals nothing but traps.
Try to spread out your traps and add as many 2x2 open spaces as possible. This will hinder its effectiveness significantly.