It certainly helped prevent me from finishing more than one night's worth of reading.
If you click on the little camera icon at the top you can see an aerial view from 1924, 2006 or 2008. Kind of fascinating to see the changes. Definitely zoom in though. And, as a reminder, South Brooklyn looks strikingly the same, as it was and continues to be mostly brownstones.
Anyway, an excellent use of your tax dollars at work, NYC!