In the 18 months I have had my SHO, I have used this feature ZERO times.
Problem is. Any time I am parallel parking, there is usually people following or it's on a crowded street. In the real world, you can't creep along as the car "searches" for a spot to park.
I usually find a spot to park and am already to do it myself before the car is ready. It's just too slow to process.