Creep means you can park your car with only one pedal, if you have to actually push the accelerator to move and then the brake pedal to stop, parking becomes a hassle. If you stopped short, now you have to push two pedals to move up less than a foot - just that series of events is highly prone to error in timing.
But I guess one pedal drive fixes that to an extent.
ICE creep was the original one pedal drive, just the other way around. And much much more controllable for slow speed parking maneuvers.