And in the above Linux networking example, this response is analogous to the person who says "But I wrote my own scripts to fix my ethernet configuration, I don't see what the big deal is!"
Edit: That came off a bit harsh. I just don't think the fact that it's not a hassle for us means it's not a hassle for other people. And I don't think that mongo's easy configuration means that it should be used over postgres in all cases, just that postgres should take notice that people like mongo's easy configuration and step up their game in that department.