Especially in New York, and with standard Google Maps service, it's not hard to find where things are. It's hard to find that they exist -- and, if they do, whether they fit your need...and clicking around on a map is not the efficient way to do it. Nor to enumerate it.
Even the most famous map -- John Snow's cholera map -- was not revolutionary in itself. Snow didn't find out anything from mapping, it was just part of the documentary process and the one made famous by Tufte. But Snow himself would've concluded that the map was of little evidence, because such maps were used to prove the miasma theory that he was trying to disprove. And his map, without the data that he collected, fell into this visual trap.
So what is the way to do things? Use a spreadsheet. Think about the important facets about each entry. And hell, one of those could be "address", and in literally one step, you can also make a map out of it if you want.
And when I mean "especially in New York", I mean that geographical distance is not the most useful metric. Even when it comes to geography. I prefer proximity to what subway station, and that is a kind of metric that is obscured/obfuscated by a map