Allow me another swing at the ball...
I've seen bluegrass pickers play blazing fast with the standard, or "narrow" neck. Therefore, the argument that a wider neck facilitates faster left hand playing doesn't hold any water (as Mr. Poppagator has already pointed out).
And any barre chord is a killer for me. My Bm chord sounds like a cat being give its first flea bath. So I haven't found any fretboard that is particularly beneficial for me. Paws just were not meant to play the guitar, I guess.