Walkthroughs for custom maps.

Maybe they just couldn't be "zombified" into thinking that the HD mod is incredibly cool, and that it's impossible to play Heroes without it.

You have a very poor understanding of the minds of the majority of Heroes players if you think they switch to the HD mod just because they are "zombified." Do people switch from old button phones to modern smartphones because they are "zombified" by "Apple and Microsoft"?

This analogy is very appropriate because the HD mod, compared to the original Heroes, is significantly more convenient, first and foremost. For me, the top 3 advantages of the HD mod are:
1) You can use hotkeys to split units into individual units when trading with a merchant to whom you want to leave, for example, one goblin; you don't need to manually split the stack of goblins; the single unit is automatically selected when transferring.
2) The HD mod runs significantly faster.
3) Suppose I'm playing a difficult battle and at some point I realize that I can no longer win this battle, but at the same time, many of my units are still left on the field. In the original Heroes, I then either have to restart the game or start an automatic battle and wait for it to end; in HD, I can load a save through the battle menu.

It is because of these changes that I can no longer play Heroes without HD. When I remember that in the original Heroes, I had to split units into individual units "manually" in every early battle, wasting an extra minute on this incredibly boring task, while in HD it is done with one click, no thank you.