Yea, I get you. That's why usability research is so important - these interfaces may be simple for you and I, but small issues / contributors to increased cognitive load make a big difference for the large majority of people who do not live and breathe computer interfaces. I get that not everyone can afford to conduct their own studies, but that's why small orgs (and even modestly funded FLOSS projects) need to be making use of the work of players like the Nielsen Norman group who release their reports very affordably, even if they have an expert on hand. I always try to remember that every interface is contrived, so there is no such thing as an "intuitive" computer or machine interface; interface usability lives or dies with discoverability.