I picked up Riverside Drive going north at 116th today and rode it up to 165th. It was terrible. Seems like it would be a solid choice maybe at early hours or weekends, but after 5:30 is was an insane 2 lane highway with cars, delivery trucks, and buses randomly stopped right in the middle of the right lane. That, along with being lined with parked cars on the side makes it a death trap for sure, and I'm not too shy about riding the city streets.
I def prefer jumping off the Greenway at 158 and going up 158>Riverside Drive>Up 165>Fort Washington>Bridge. This is the best climb out I have found so far.
The wide ass side walks along riverside would probably be awesome in the winter to get out of the wind. I doubt anyone would bother you.