Well, it depends on what you put in the traps and what purpose they serve.
For example, I want gobbos to be pushed into a pit that houses several tamed megabeasts. That or an atom-smasher. So with the flick of a switch the 3-tile wide hall turns into a one-tile wide walkway with many singular mace traps.
Really, nice things can be done with weapon traps.
Or a theory of mine: A trap that almost never gets clogged. Rig up a trap with a buncha weak pierce-style weapons, and wait for something to trigger it. At least one internal organ should be damaged, causing the thing that triggered the trap to die soon. Not when the trap is triggered, but soon after, several tiles way.
At least in theory.