You have great advice already. I have done both (bus to MK or taxi) for an adr. When I chose the bus to MK, I wanted to ride the small boat from MK to the Poly. If you happen to see it nearing the dock as you walk to the monorail - and you have enough time before your adr - it's a nice boat ride. If it isn't near the dock, I would continue on to the monorail to make sure you get to your adr in time.