I have a Volvo as well and it is annoying when the dashboard goes nuts warning of impending doom when experience tells me that the vehicle/obstacle ahead isn't actually an issue. That said, it has saved my bacon at least once at an unfamiliar highway exit in rush hour when traffic went from 40mph to a dead stop almost immediately.

Lane assist has also led me to be much better about always signaling lane changes lest the steering try to fight me.