I like to use traps where traps are most appropriate: to defend crypts or tombs, or the lower reaches of temples, or in areas inhabited by creatures known to prefer the use of traps and deadfalls (kobolds, bugbears, troglodytes, derro, etc). But if the dungeon is a thriving location, like a giant fortress or a hobgoblin garrison, I don't put traps there, because it doesn't make sense to put pitfalls in place that would endanger the residents.
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