A ship jumps to warp and no one inside feels movement. A ship comes to a dead stop and no one inside feels movement. A ship does all sorts of tactical maneuvers and no one inside feels movement.
Why? Because it has inertial dampeners, and down is where the gravity plating is.
So why would a ship's occupants get thrown about from a disruptor blast? I could understand mild shaking or vibration, but I always thought being thrown across the bridge was a bit ridiculous.