The "quickest" way... ignore the loader who is yelling at you to take off your shoes. As you start walking through the WTMD and the TSA person on the other side looks at your shoes and yells at you that you have to take off your shoes, firmly say "I have a medical condition and can't take them off." That should be enough, but if not, give a few hints at what the medical condition is (ie. diabetes). If the screener does it "right," you should then be sent to the secondary pen and only have your shoes ETD.