Well you can park manually too lol.
Its more about look what my car can do. I love all the technology, amenities and gadgets Ford have stuffed into the Fiesta, and now even more so - the focus.
As much as I love 'driving' I have an automatic, and if I went for the new Focus I would certainally opt for the park assist, city brake assist, lane assist, steer assist, powershift auto box etc etc. Even if not using these things constantly I'd still be happy to know my car could do this stuff. And who wouldn't be smug showing off all these gadgets to their mates the first time they bring home their new car.
Maybe I'm a car snob lol
edit: ...or geek
only issue is its more to go wrong