So, in effect, 60% for not meggering (which is my experience), 40% for meggering (which is my co-workers position). This is pretty much the same results I've found on Google.
Unfortunately, it doesn't seem like there is any one "standard" that everyone uses (like the NEC). There are ANSI standards, IHS standards, IEEE standards.
My thought on it is this: it will add a decent amount of work. Our electrcians are overscheduled as it is. We've never had trouble because wire insulation broke down (especially in a 120V/24V control system).
We megger any wires/cables that we pull through conduit or raceway, motors, and megger heat trace several times when we install it. I just didn't think panel wiring needed it as the chance for damaging the insulation while installing was minimal.