In SF, I see people double parking everywhere, Uber or not - and I mean _parked_, not idling. My kid's school literally spent 20 minutes last parents night begging people not to do that in front of the school (and it's _still_ a problem).
Going westbound on Golden Gate st around Fillmore is one of the weirdest thing I've ever seen. You can see entire lines of double parked cars with no drivers inside (sometimes on both sides of the road!)
Then you also have the way-too-small MUNI bus stops where the bus has to double park (e.g. along Fulton), the delivery vans and the random dudes waiting for a parking spot to hopefully free up somewhere in the block.
Even without considering Ubers, driving in SF is already a shitshow...