^ I am not a disbeliever, per se....but in all of the years that I have been doing this, very little effort whatsoever has been put into protection against this problem. Like myself, I've had technicians ground themselves by touching a chassis, but I've never once seen one put on an anti-static wrist strap. This includes vendors such as Dell, IBM, HP, EMC, NetApp, Liebert, APC, etc.
These write-ups are all interesting, and technically I am sure they are sound and have very good justification. But my real world experience, as well as the real life experiences of everybody know that I know in the IT field also justifies the fact that very few of us have ever done anything more than touch something grounded and then proceed on our way without any undue hardships. And I feel comfortable saying to most people that given what I have seen and done, in my years in the industry, you probably aren't going to blow up your PC if you decide to work on it without using antistatic mats, wriststraps and special shoes.