I eat breakfast at a cool little sandwich shop on my way to work. In the nicer weather, I'll sit out front, on the benches. It just makes bike commuting an even more "Geez, life is good" experience. As far as the extra time it takes, I leave extra early when I commute by bike, anyway, so most days, this isn't an issue. And regarding digestion while riding, the sandwich shop is only about a mile from work, so THAT isn't a problem, either. I would think that piling a breakfast sandwich into your belly at the beginning of a longer commute might be an agida-maker.