We elected to take a cab. We had the kids doing the Pirate Cruise and they'd give away our spots if we were late. For us (staying at the BW), Disney transportation involved a bus to MK, then catch the resort monorail (resort order, MK, CR, TTC, Poly, GF than MK) at the TTC. We thought the $15 worthwhile, since we'd spend $60 on the Pirate Cruise. It also allowed a more leisurely morning.
You could grab the GF launch at the MK, which I think would be quicker.