I find the two previous posts to be ridiculous. Aside from wearing out the cleat and pedal more on one side, you fail to train the body how to do it better. You also fail to develop the ability to compensate for emergencies.
The best motor learning is achieved through bilateral practice. If you have trouble exiting the pedal on one side, practice clipping out that side more. If you have trouble balancing on a bike, spend more time riding.