Cam ops are capable of walking backward on a janky cobblestone street, weaving through the crowd using only The Force, sweating profusely in 90º heat, carrying heavy and expensive gear, for 8 hours, powered only by a breakfast burrito. So a shoulder cushion is the least of indulgences. 
 
The Camera Comfort Cushion from Alan Gordon Enterprises was designed to give maximum flexibility and comfort suited to the needs of the camera operator. The cushion works with a variety of camera sizes, from shoulder-mounted camcorders to broadcast-sized and film cameras. Do your body a solid, and put something soft between metal and bone.