More practical actually, as my wife hates parallel parking, and anything that helps is a bonus - trying to find, and get into, a big enough parking space with 3 small kids doing their thing is a daily challenge.
She is getting fed up with kerbing wheels while shouting at the kids to shut up ...
I am also hoping to find the park assist useful on the odd occasion when I drive the car ... as I'm not winning any prizes for my parallel parking skills at the moment