@Ctl, don't put blind trust in aerial imagery in the US, it can be misaligned like everywhere else (eg you'll find an offset between Bing and Esri in this particular area). @Derek, while I, too, wonder what drives Ctl to map the way they do, they don't have to explain. Driveways are "a thing" in OSM, even though where I live we tend to use them only for "non-obvious" cases where to reach a building the method "park on the public road in the spot that is nearest to the building" does not yield good results. Ctl seems to add driveways even where they add little information, but MikeN is right - maybe someone comes along and wants to calculate what percentage of ground is asphalted or so and then they are happy to have this info. 

It appears that Ctl is using Mapbox satellite imagery which in this area appears to have an almost identical alignment to Bing; therefore I am surprised to hear that adding buildings from Microsoft's data set causes overlaps. This is perhaps a matter that deserves a closer look; if either Mapbox or Microsoft are so misaligned then it would be good to apply some correction when using these sources.