I've heard one of the 5-star people has drunk a glass starsan to demonstrate how safe it is. I don't worry about the starsan on my hands so much as the pbw, my skin doesn't like that stuff.
Don't be too impressed. That'd be like watching him drink a Coke.
Phosphoric acid is used in Coca-cola (pH = 2.5). Phosphoric acid is also one of the key ingredients in StarSan: 50% phosphoric acid and 15% dodecylbenzene sulfonic acid. I'd actually be more worried about what dodecylbenzene sulfonic acid does once it gets into your body. I can't find much info about it online beyond the usual safety guidelines. http://www.inchem.org/documents/icsc/icsc/eics1189.htm
Your stomach secretes hydrochloric acid and pepsin to break down food. The pH of your stomach environment ranges from 1.5 to 3.5. The only reason the stomach doesn't "digest itself" is because the lining of your stomach secretes a lot of mucous to coat itself and the epithelial lining is constantly replacing itself (500,000 cells slough off every minute and the entire lining replaces itself within 3 days). Contrast that with the skin of your hands: No mucous protection, and it takes 28 days to replace itself.
I wear gloves if I'm working a long time with the solution--just to avoid the "dermatitis." Euge is right that hand lotion will help speed the recovery, but, if you wear gloves, no recovery is needed.
I'm not worried about the scant amount of StarSan that remains behind in the fermenter after sanitizing (i.e., the foam)--it is not the same thing as drinking a whole glass of it.