Just tried it: yep, adding pathfinding to aggressive units definitely makes game more interesting.
For a simple experiment, I added ranged attacks (fire and acid) to pathfinding-enabled bears and wolves, and it is so funny when they come directly to the house and aim me through the door which I left non-blocking for ranged attacks, but impassable for enemy movement. Now it makes sense to prepare minefields (sorry, trapfields), or install wooden doors on those popular forest trails 🙂