So... my wife is THRILLED about this feature. She LOVES having her truck and LOVES how big it is (current '16 Sport Crew Cab 4x4), but, she self admittedly, can't park it. I can typically pull into a space and park her truck without a problem, but I have good spatial relation skills (I'm also good at Tetris). She can't wait to use this feature as she can't parallel park to save her life in any vehicle (not that she has to do it much), but she also has issues just parking period, so she can't wait to try out the parking feature of the truck.
For most of us I would agree that the feature is pretty useless when you can actually drive.