Yes we are actually. But the game has no idea what object your eye is tracking and it's usually set to the player character in 3rd person and cursor location in first person.
In a film/video, you, the director, can know what the focus object is. It's tougher for a computer to do that automatically in real time, though, it is getting better. That's the key difference between "good" motion blur implementations and garbage blur.
And camera stablization helps a lot. Proper film-esque panning and camera shots help a lot in making a scene look cinematic.
