I'll have to respectfully disagree. The ability to review the histogram after taking a photograph is an easy and essential learning tool. It's a fantastic way of closing the feedback loop. Take a picture, look at the histogram, rotate a dial, look at the histogram. There's no more direct way to see how the manipulation of the ISO/shutter/aperture settings affects the actual exposure. Think of the camera sensor as a matrix meter with millions of cells where you can readily see if any cell is over or under exposed.
If thirty years ago there had been a magic box that you could attach to the back of the camera which would show what the histogram does, photographers would have paid thousands of dollars for it and talked non-stop about it. But since it's a part of the digital system, some people think it things too easy. For those who invested all the work into learning the old way, where they had to close the feedback loop themselves through test shots, Polaroids and documenting their exposures, it seems so easy now that the student must be missing something by doing it the new way. But I don't think so.
In the course of a decade or so, film went from "this is how things are done" to "this is how things used to be done". Film used to be with it, contemporary, an essential medium of communication, and now it's not. Now it's backward-looking, and nostalgic. Why force new students to read an old alphabet? Aren't we trying to teach students today's tools for today's jobs, to communicate today's ideas, and prepare them for tomorrow's world?