Even once is not never, because nothing else will do that job.
Note too that there people who use their bed but never tow, the fact that a truck could serve either purpose but for some only does one doesn't mean that those people don't use a truck.
Even if it doesn't fit in your garage (because it's full of cars/stuff), you can park in your driveway. No one will complain if you block the sidewalk, because no one walks anywhere.
Shopping areas have large parking areas and structures. It is not unusual to see pickup trucks taking up more than two spaces. Parallel parking is uncommon and usually can be avoided.
What is conspicuously absent from these numbers is a response to the question "do you never use the bed or go offroad or tow with your truck". Which is the case that the article seems to be trying to make but can't.