Interesting article with good advice. The thing is - how do you eat while riding (since I can't see him advocating a stop every 20 minutes)? I can do the safety things while riding - signal and such, get something to drink (although I'm more comfortable with my Camelbak), but I can't see getting something out of my jersey pockets without taking a tumble.
Stop signs are good places. And getting something out of a jersey pocket isn't as hard as you think it is. (I actually have an easier time with that than I do grabbing a water bottle while riding.) And obviously, if you need to stop, do so when it's safe.