Well, as i said in the other thread:
About less talking, more slaughtering.
In all good zombie-movies (including romero) the setting is only a "background" for what is actually happening.
Romero used zombies as a reason to put humans under extreme pressure, in a situation where they want to survive against all odds even though that means loosing the humanity itself.
Simon Pegg describes it well in one of the "the walking dead" books.
With The Walking Dead, Robert Kirkman has brilliantly captured the spirit of George A. Romer's definitive version of the modern zombie and applied it to his own epic tale of survival. I would imagine everybody reading this has at some time or another asked themselves the question: What would I do? How would I survive if it was me against them? Whilst our favourite zombie movies always seem too finish far too quickly, leaving us wondering what happened next, Kirkman is able to savour the journey and explore the many dangers and dilemmas facing his increasingly diminishing and outnumbered band of survivors. Often, as in some of the best zombie stories, the ghouls themselves are merely bit part players, a context in which to play out the human story. Our real concerns are for the people that remain, for their future and by proxy, our own.
The Walking Dead brilliantly captures the simple truth that in the face of Armageddon, the little things remain unchanged. We still love and hate the same people. We still like the same bands, get the horn, remain frightened of heights and spiders. Kirkman cleverly focuses his narrative on the enduring minutiae of human existence and uses a full blown zombie apocalypse to bring it into sharp relief. Often the roots of great fantasy are firmly embedded in the truth. It is this simple reality that makes The Walking Dead such an engrossing read.*
(simon pegg in walking dead volume 2, "miles behind us")
Zombies, is as said just a excuse to put humans into a desperate situation, it could by all means just have been a natural disaster, a war or whatever reason. Romero and Kirkman choosed to have zombies because they are much cooler, and helps make more excitment than the alternatives.
The walking dead uses more of the "human-drama" so to speak, because it has time to do it. A luxuary most ordinary movies don't have. The luxuary to do a really deep dive into the mind of the human imagination and play around up in the heads to some that have everything and nothing to live for. And the drama that then can happen.
If you have problems to imagine such "dramas" to happen in reality, you can just watch how humans react when put in extremly difficult situations.
Plane crash in the andes-mountains, stanford prison experiment and so on.
If you've read the walking dead cartoons, as i did - it is very much that happens, (and words by the author himself) that says that this is 90 percent about the characters, and not zombie-slaughtering