I think you're right FFF. Two very distinct camps. My own 2 cents worth is this: I like to practice glide approaches as often as I can. Apart from the safety aspects, it also helps to build confidence in the aeroplane and your own abilities.
However, I am also of the opinion that doing so is pretty hard on the engine. Just think: you go on a longish cross-country at 75/80% power for one or two hours, and then close the throttle fully as soon as you start your approach. I think that the resultant shock cooling shortens your TBO considerably.
However this is just my opinion - can anyone give us any relevant facts?