https://www.youtube.com/watch?v=MHlAJ7vySC8
Follow me here: the above shows a heavy spinning mass being easily moved around, with little effort. Suppose there was a way to move electrons this way? Instead of the electrons spinning co-axially on a wire (like a doughnut rotating while it moves along a rod stuck thru its hole) - suppose we had a way to get the electrons to spin at right angles, facing outward - just like Laithwaite's gyroscopic rotor.
In effect, if there was a way to change an electric current this way, you could propel electrons along a conductor with little effort because they would be "massless" in a practical sense.
I hope I've explained this clearly so that it can be visualized. Or just watch the video and think, 'what if this was a spinning electron in a conductor instead of a rotor being whipped around?'.