If we are really concerned about making it nicer for the next guy, why stop at avoiding postholes? I'd also like to not have people all go in the same trench, could you please widen it by going at least two across, and preferably three across? This way I can possibly get a turn in for my skis.
For those breaking the trail with snowshoes, you should also be required to wear some big, beefy, old wooden 54" snowshoes. After that first pass, smaller snowshoes should be worn. Nothing worse than having these spanky new snowshoes going first, and having the trail "broken out" with a print that isn't much bigger than a pair of sorels.
On the steeps, please ensure you are doing your kick-steps for a person in the size range of 5'6"-6'1". Stopping at regular intervals every 200 steps, with a flat section just off the trail so I could stand and give my calves a break would be nice. And, of course, it should go without saying but I will anyway, that avoiding glissading on the way down so as to not ruin the kick steps that were just built would be nice, too.
Next, I think that everyone breaking trail should be, at a minimum, 6'4". It doesn't make a whole helluva lotta sense to break a trail with a short person, because I may still come up behind you and hit some low-lying branches and get snow down my shirt and my bum gets cold.
Why stop at postholes?