I'll confess to using protein powders. I prefer the egg white powder because it is close to flavorless. I put it in water in the blender with a banana or a bunch of frozen berries as my after work-out breakfast. Since I do not enjoy fruit very much, that's my daily fruit.
However, this is not really using the powder as a supplement. I's just using it as breakfast with 25-30 gms of protein. Otherwise, my breakfast would be just two mugs of coffee.
Most trainers tell weight-lifters to have a dose of protein after heavy lifting. It sounds logical, but nutrition is a field packed with superstition and magical thinking. Other forms of exercise do not require a shot of protein because they do not produce muscle fiber damage.
Powders as supplement would, I think, entail maybe twice-daily use in addition to normal balanced meals. Since I can't get on board with three normal balanced meals, I probably should do a second dose of powder protein to make sure I have enough daily protein.
Or maybe it's all magical marketing: Protein Powder and the Promise of Transformation
What's your view?