It's useful enough that I could find out the exact spot I slept by the river Seine years ago based on scrolling around Berlin on the map for 5 minutes until I found the photo, taken several years ago on a completely different iPhone, then go back there recently and recreate the picture.
When you open the Photos app on iOS you have a beautiful map with clustered thumbnails.
http://tinyimg.io/i/d4DRgIT.png
http://tinyimg.io/i/0lVO6KC.png
It's useful enough that I could find out the exact spot I slept by the river Seine years ago based on scrolling around Berlin on the map for 5 minutes until I found the photo, taken several years ago on a completely different iPhone, then go back there recently and recreate the picture.