For the most part someone with an educated mechanic's touch doesn't need to use one. I've used a torque wrench so many times that I've literally worn them out. A larger switchgear can take up a very large room and can have a thousand or more torqued fasteners in them, every one of which gets painted with a paint-pen across the nut and lockwasher after torquing to show that it has been torqued correctly. After spending hours crawling around inside a gear like a jungle-gym hitting every fastener on the copper bus bars, the standard torque values start to get imprinted directly into your nerve passages.