The good thing about Google maps "get directions", when you click on the bike icon, you get all the bike lanes depicted as green lines on the map. I love it. Last week, I rode into Queens county, New York, 18 miles from my starting point in Nassau, and most of the trip was on bike lanes.
I say YES to Google maps. I did however choose my own route.
une minuto...
I just tried "Mineola, NY" to Kew Gardens, New York, NY", and Google gave me a much different route than what I took.
In fact, the Google route was six miles shorter, and did not use most of the bike lanes I used.
So my results were the opposite of what the OP got.