Lolz, there's such an anti-supps ethos going on at present.
There is benefit to protein powder supplementation. Quality milk isolates and whey isolates have some pretty splendid and useful amino acid profiles in concentrated doses. To get the same quantity of protein in the same AA ratios from whole foods would require, for example, drinking ENORMOUS amounts of milk (and therefore all the calories that that entails; think GOMAD~!)...
Studies have demonstrated the unique benefits of milk proteins in relation to protein synthesis. And anecdotally (though I guess it potentially means sod all), people have repeatedly reported busting plateaus after turning to post workout supps. Obviously, the most important thing is having your diet in check generally and HAVING A PROPER TRAINING REGIMEN... But still, I don't think the facts about supplements should be ignored.
And on that note, I do recommend myprotein's Impact Milk Isolate, with which I personally found better results than with the Whey Isolates I used to use.