When you are no longer using your body pillow as a body pillow it also covers the full width of a QS bed, so you can snuggle up to DH without having your head between the pillows

FG - To provide support for your belly and something for between your legs it is helpful to have a much bigger pillow, and if you happen to have the bed to yourself you still have something to cuddle. If you are a back sleeper it also provides enough support to be under your hip without the rest of your body twisting because it goes from shouler to mid calf (or knee if you are really tall) which helps to reduce stiffness.