What I found surprising about the video was that it made an engine seem, somehow, less complex and daunting. I'm sure that's a bit of an illusion created by the way the engine is taken apart (and the fact that it's not in a car and therefore you can rotate it as you need it, etc), but amazing work.
For me it confirmed that the basic things I'd learned from Car Mechanic Simulator were relatively valid... I've never even changed the oil on a real car, but I could name most of the parts in that video.