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OSM has this much detail? The buildings and such seem way more fleshed out than I'm able to see on OpenStreetMap. Were those added via some other mechanism, or is there more data in OSM than I thought? Like, even height doesn't seem to be available, much less shapes like spires and such as shown in the demo image.

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There is more data than you see in the 2d map tiles but you can turn on the Map Data layer on the website or use an editor to see. Here is one of the ways that makes up the spires in the blog post http://www.openstreetmap.org/way/227682021

You can read more about the properties used to make up a complex structure here https://wiki.openstreetmap.org/wiki/S3DB

In general, the data isn't there for most locations, but it has been added for some locations. For example, Saint Basil's Cathedral: http://www.openstreetmap.org/#map=19/55.75252/37.62300&layer...

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