If you were buying passes for a family of 4 and there were only annual passes for one park in the budget, would you choose the Gold pass for USH or the DCA-only pass? For me, it would be the DCA-only pass, easily. DCA just has so much more to offer than USH. It's just a better value for that reason alone, even if you do have to pay for parking.
And that's not even taking into consideration how much jerking around USH has done to their AP base, and how relatively well Disney treats their pass holders. I think Universal has alienated their pass holders to the point where Disney can just pick them up cheep - so to speak.