Aggie, I think you are my twin sister. Didn't learn to tie my shoes until I was 6. Used the bunny ears for at least 2 years after that. I also learned to ride when I was 9, almost 10. And, I always unclip left. I know when I started with clipless, i did it right and now I don't remember why I switched. But, on my mountain bike, unless I'm in a very scary situation, I can use both feet.
One time, I decided to experiment and try to unclip right when I was coming down my driveway, to the part right in front of my house. I unclipped my foot, but I felt like I could not lean right and put my foot down! I quickly clipped back in and unclipped my left foot and stopped. My whole body felt wrong when trying to lean right; I just couldn't do it. I also cannot get on my bike from the right side... yea, I know my laterality is messed up.
After almost 9 years, I think it would be hard to retrain myself. I've had the same comment from a few people about how this will lead to killing myself, but so far I've been able to stop in some pretty tough situations.
And I clip out by twisting out (Speedplays). I know I have clipped out by turning my ankle in with spds, but not in a long time.