So you would rather your phone never sleep? Battery life would be nothing if it worked like that. Is it really that hard to push a button???
I'm not sure what the logistics are as far as how inefficient it would for the phone to be prepared for a touch at all times. But doesn't the Galaxy s4 wake when you swipe past it? So I don't think it's unreasonable at all.
But perhaps this is the best solution. Even so, the reaction is coming because it's not the way Apple was saying it would work. They said that to unlock the phone all you had to do is put your finger on the button, and the phone would sense it was there. But this is not how it works.
And when using the phone many people have been slightly annoyed by the process. Regardless of how petty you think the complaints are, those opinions are valid.