protein ingestion post workout makes sense on the surface... but even whey protein, the fastest of all proteins to digest...still takes about an hour before any of it reaches the blood, and even then its not an "all at once" dumping of the aminos...but a slow gradually increasing process that spans several hours.
if protein intake is suffficient on a daily basis, then theres no need to "time" protein intake around workouts.
carbohydrate ingestion before, during, and after workouts does make sense... glucose can reach the blood within minutes and start taking action, mainly increased insulin and vasodialation