Some examples of decent traps could be:
- Alarm traps, notifying some enemy of your presence.
- Environment affecting traps. E.g, blocking off a passage, forcing you to take a different, probably more dangerous, route. Or the opposite, where you need to disarm the trap in order to pass through (although I would probably classify this as a puzzle, not a trap).
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- Traps that deal damage but also instantly start combat, so you don't have time to heal up.
I really like those 3 ideas, especially traps that affect the environment. Those could happen systemically with a destructible bridge next to explosive traps.
Now I think of it, BG3 already has traps that can destroy ladders. More would be welcome.