There's a picture of one here, and the main road is a single lane in both directions. Which is as far from Queens Boulevard as you can get.

The 2 lanes to be crossed makes crossing safer. Further, the side roads are differentiated to make it clear that they are primarily for biking/walking (they are a different color, and are tiled).

Also:

> Service roads are purposely constructed to be discontinuous sections of road, meaning that through traffic cannot use it to get from one main street to another. Since the only traffic on it will be cars accessing the houses or shops along the service road, traffic is substantially lower that on the main roads, and speeds are kept down due to the short segments of roadway

Queens boulevard is a highway masquerading as a road.