It's very useful, for instance, to gather, all the conventionals into a Query folder, or all the moving lights, or all of FOH, etc. I would love to be able to click that folder and turn all the objects inside of it visible or not visible by using the "eye". Or at the very least, a "select all" right-click on the folder that you can then apply visibility to all the objects inside. But I think it would still be better to just apply it to the folder itself.
