It's funny that people are stunned by this (I was too, but then I had a longer think about it). Yeah, making all this with blocks is amazing, but people really did design this stuff in much more detail in other places.
The movies, the games... giant feats of this magnitude happen in all AAA releases these days, but we almost miss them because of their incredible realism.
Yeah, the fact that this has a lot of scale is a big deal. But it's not like this was all done by one guy, so how is it different from how amazing normal game design is? I mean, yes, there is shorthand used in these designs to speed up the process, but even then I'm sure the detailed work involved is still bigger.
I suppose it has a coolness factor in the sense that it's done by amateurs and still accomplished very well, though. So, I'm not trying to burst anyone's bubble. Just trying to open minds to the other amazing stuff we're taking for granted.