I think GWA as a name convenes as much information as power attack or Bigby's X hand, which is under which letter in the feat list I can find the description. Power attack is no more descriptive than GWA. If I want to use power attack in a game, I have to look up mechanics of the feat. If I want to use GWA in a game, I have to do the exact same thing.
The only thing GWA has that power attack doesn't is some fluff that can either be used to flesh out the powers my wizard uses or be completely and totally ignored with zero reprecussions.
The only thing GWA has that power attack doesn't is some fluff that can either be used to flesh out the powers my wizard uses or be completely and totally ignored with zero reprecussions.