I agree with the tip. I always unclip my right foot because of the way roads are shaped (the crown in the middle). Never had a problem with losing my balance. The last time I fell at a stop was 1989 with toe clips. Sometimes I will put both feet down if I think the stop will be more than 30 seconds but then I unclip the left after I'm stopped.
I also put my left down on a motorcycle but that makes sense as your right is on the rear brake.
Some other fairly good tips...
1. Make sure to pay close attention to your hand position when using the webbing of your gloves to clean glass off your rear tire (while moving).
2. Learn to ride with no hands. It will teach you a lot about bike handling.
3. Whenever you see a chick on a bike...use the -2 factor (If you think she's an 8, she's really a 6...you just think she's cuter because there aren't as many women out there and she's doing something that you like to do). This rule applies equally well to the golf course.