The article talks about how you can get your car washed and filled with gas by parking lot attendants. I think this combined with valet parking is so convenient. The garage where I park even has an attendant who will drive my car to the mechanic shop down the street and leave it for maintenance.
Then an attendant will pick the car up and put it back in the parking lot. All this happens while I am at work, so this saves me a lot of time and I don't have to stress about leaving work or taking a day off work.