I would be what is considered a Google Maps Power User for the last 10+ years, everything from user to developer.
Just last month, I finally had enough and downloaded Open Street Maps. Not because it's "better" overall (i.e. obviously Gmaps is more polished, smoother, cleaner interface, satellite tiles, etc), but because it's better in the way that a normal person would want to use a "map". Emphasis on "map", not an advertising board.
For example, I was trying to find the name of a very prominent river in Alaska, and no amount of zooming in, panning, clicking, or tilting in Gmaps revealed the name. I followed the river from start to finish, thinking it would display the name eventually, with no luck. Same for a prominent mountain. Similar results happen for things like street names, labels, anything that is not the nearest McDonalds or the 17 Starbucks that are in the viewport (that I'm clearly not looking for or interested in, based on either my searches or my clicks).
It's getting to the point where Google Maps should be renamed Google Billboard, because it is having less and less in common with a map.