I can definately see why instructors fly wider CTS, it gives them more time to instruct checks, and patter base finals etc. But jesus its tough work flying a pitts when you have 152s bashing the circuit.
Those wide CTS can be the bain of your existance if you get an engine failure on base, as you wouldnt be gliding distance to the runway
I remember the days of flying the Bankstown Circuit, and tower saying Sydney CTR is complaining about the wideness of the circuits, "could everyone fly closer to runway as your infringing airspace"