Nobody can learn any Windows in 5 minutes. I submit that it takes a lifetime - 60 million lines of code!!! Some are pretty good at it (e.g. Mark Russinovich), but few really know it all - if any.
Knowing how to click on a few tiles is NOT knowing the OS. Someone who 'knows' Windows 8 after 5 minutes I would at least propose as a MVP - if not a Microsoft Fellow.
But lets face it even getting into the Control panel and Device Manager is easier than before, just a mouse click away. A couple of hotspots and right mouse clicks, that's Windows 8.
Naturally if you're going to get really technical it's going to get harder, but then so is every OS on any platform.
What you really mean is operating an appliance called Windows 8.
Far too many times I've seen people dance to the latest corporate mantra, because they are too afraid to speak up when there's a glaringly obvious problem. When I see something that's clearly going/gone astray, I say something. A lot of people don't like that, especially superiors who think their latest idea is the best thing ever; too bad, they'll get an opposing view whether they like it or not. Many a time they'll come back later and admit that I was correct.