I've only done it once, but I got saved by being on a hill while parking. I had wanted the hill to let me roll back a little bit and I was going to stop it with the brake, but instead I lurched forward because I hit the accelerator. Given I was on a hill though my mistake had to work against the uphill and I didn't jump up to far before I took my foot off, rolled back a little, and properly braked. It was very strange and confusing in the moment.
I'd be curious how often this happens with basic cruise control on the highways, but (edit: I suspect) highways are more forgiving to the mistake than with something like FSD on windy neighbourhood streets.