'I'll drink protein shakes when I need to slam some protein quick, i.e. after a hard weight session or a run over 10 miles. ..I need a bit of protein during, not after, longer (over 60 miles) rides. '

Your right! Its recommended after working out ( esp with weights, so big gears count or hills) to keep muscle working and in good repair. In long ride you might need protein, as your body will use it after a certain point. ( Very prolonged activity, as much as18% of total energy requirement.I think that would mean, 3- 6 hour rides. Usually make only about 5% of energy needed.

I dont eat meat or grain or soy, so I drink it all day long( 3 or so). Its winter so I have it hot( dissolved in cold water, then add some hot), in muffins( the best way!), mixed with eggs and berrys made into a pancake type thing( with sweetner).
I use Stevia for sweetening( no calories , natural and good for you , apple juice or honey.
I even ( sadly) have some artificial choc flavor( alas allergic to choc) to put in it.