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.
The first time I went to the Netherlands I walked from Schiphol airport to the center of Amsterdam and it was an easy but amazing experience. Walking from JFK to Manhattan is a completely possible walk in terms of distance (I usually do better than a 20 minute pace on the flats so it takes only half a day) but when I think of the battle with the infrastructure you'd have to do it's like an Arnold Schwarzenegger movie.
It seems to me that in such cases the US tends to choose to expand into a stroad instead. Belgium also has quite a few stroad-like roads, but at least those tend to have usable sidewalks and fairly often even bicycle paths.