It's SO true...........a Cessna will taxi nice and slowly at 1800 rpm!!!!! The conversation/sequence of events goes something like:
Instructor: Are you riding the brakes?
Student: No.............(followed by release of said brakes/aircraft careering left at high speed onto grass/towards parked aircraft/towards ditch)
Instructor: I have control. There you go, we're back on the yellow line. You have control. (Repeat several times).
ATC: G-CD, do you have a problem?
Instructor: Negative
Yes, of course we do try to retrain but there's a limit to the number of times you can stop, rebrief and restart the exercise in the space of 500m.