By the time I went through music school and started teaching, my head director at the time had a comprehensive program of passoffs for marching and concert music. All-Region season included weekly checkpoints on the music (for top band at least). There was a pre-planned curriculum of scales and fundamentals that covered the 3 years of high school band. The biggest part of my job was pulling kids into a practice room one at a time to hear them play their assignments.
I've been through a couple of jobs since then, and every school where I've taught has a system of some sort. Passoffs, recording assignments, SmartMusic, something. Now that I'm the head director myself, I have my own system in place.
Has band directing changed that much in ~20 years?