Mac or PC, the idea that laptops should not get warm, or that you put them directly on your naked legs or something and then you complain about their heat is completely alien to me...
And yet, it's not that strange; laptop should be used on the lap, hence the name, right? High CPU usage, fine, but for regular things that should be perfectly optimized by now like watching videos or using Skype shouldn't cause as much heat as - apparently - it does.
Maybe that's the origin of the name, but there are, well, desks, kitchen tables, folding trays on airplanes and tons of other things besides.
Who really uses their laptop "on the lap"? Is that a comfortable position to read or type in the first place?