I find the emphatic statements against riding on the sidewalk puzzling. Yes, in most circumstances riding on the road is vastly preferable to riding on the sidewalk, for a multitude of reasons (not least being the safety of both the rider and pedestrians). Yes, in many locales riding on the sidewalk is prohibited.
However, I don't see anyone advocating riding on the sidewalk, so the arguments about it don't make any sense. And, there are some circumstances where riding on the sidewalk is justifiable, for example riding adjacent to a multi-lane high speed road for a short distance to connect parts of a ride.
Using the crosswalk does not necessarily imply riding on the sidewalk. The question was about using the crosswalk, not riding on the sidewalk.