I don't think the procedure is "documented" in most airlines operating the 737.
However, most pilots flying the plane probably do it. Just think of the benefits of doing this simple check. I would (and do) it. Simply because it helps. It's alot to say the check is a "safety net", the config warning will sound early on the takeoff and 99.9% of times, an eventual reject is easy, but why do it for this reason when you have the benefit of being able to give it a try before?