I do drink protein shakes, mainly because I'm underweight and it's an easy way of getting calories when I'm not hungry or I'm in a rush. Previously used egg white powder (makes everything taste like uncooked cake mix, surprisingly delicious) but ATM I'm slogging my way through Ausbodies 100% whey, which tastes utterly terrible.
It shows! Luckily heresay and conjuncture count for diddly squat in science. It's been known since the 80s that a higher protein intake causes a positive nitrogen balance. Hyper trophy is a different matter all together.