One of the most challenging things I did in a simulator was flying the 747 classic with the feel turned off.
Flying in direct is not the same as what everyone else normally does, and all the Boeings, McDonnel Douglas, Lockheed, have featured artificial feel and feedback built into the flight controls to give the illusion that the pilot can feel the control. Turn that off, especially at high altitude, and it's quite easy to overcontrol the airplane.