choc milk is 4:1 carb to protein
which is similar to a lot of recovery drinks
Which is not same as good protein drink. Lots of commercial protein drinks are filled with sugar but luckily not all.
Optimally one would control daily protein intake per bodyweight and activity but most will not be arsed to do so.
Personally I use protein drinks after long rides and heavy training sessions if there is no real food immediately available and often use half the dose recommended.
The additional protein is maybe fifth or sixth most important aspect in building fitness (after training, overall diet, rest, skill, lifestyle etc) but as it is one of the easiest to get right why not?