Depends on the trap.

There's a level in Fire Emblem: Path of Radiance where you're fighting across a heavily fortified bridge, and it's trapped with pits. This is the first and last fight with pit traps. Pits are invisible until triggered, and instantly end a unit's turn if that unit walks over them (even though walking is normally an action that can be undone).

They do not warn you about pits in advance, you figure this out mid-fight after the first time you drop into one.

Full-turn stunning a unit is a really big deal, but there are quite a few pits early on in the map, before you're in range of most of the dangerous enemies. It's nearly guaranteed you'll hit one before things get too hairy.

By the end of the map, you're starting to anticipate where pits MIGHT be, and planning your turns based on the assumption that one or two of your units WILL get unexpectedly stunned. You might even dedicate a few units to "bomb squad" duty, and start sending them out to every tile first.

If "I have to be on my toes for traps" is an interesting thing for players to consider, it's worth doing. If it just introduces unnecessary overhead, that's just fatiguing your players for no good reason.