I'll take a shot at explaining this.
While the pushing gets alot more intensity, it's balanced out by the sheer amount of volume put on the rest of the muscles. The back gets hit with so much more volume than the front, so it kinda balances out. Most cannot row as much as they bench, but that's because they don't care about singles on the row. Your back work should still be heavy, but just not ME heavy. Heavy enough to induce hypertrophy(5x5,10x3,4x8,3x12 are all great choices), but not heavy enough to damage the CNS conciderably.
Hope that helps.