Google maps allows you to find things you didn't know existed in the first place. I've often found myself spinning the globe and zooming down onto a remote island's beaches just to see what it looks like on another part of the world. Being able to zoom down even farther to actually see the coral reefs is a natural extension of that. It's about discovery.

It doesn't matter that information about X is available if you can't find out that X exists in the first place.