fullboost - I agree entirely! Instructors (especially those that have been around for a while) should take a lot more responsibility for ensuring that they are teaching the correct procedures.
I think many pilots also fail to transmit their intentions as required, especially when entering the runway - it would often be helpful to know in which direction you are going to go tootling off once airborne.
There is no requirement to make a rolling call, a departure call, or a backtracking call. Thus, these are not radio calls that I would tend to make, unless they are going to be useful to someone. For example: a rolling call when some time has passed since entering the runway for any reason.