I was disappointed that the show wasn't veering into another dimension with thinking zombies. But the show only reminded me of how easy it actually is to survive even if outnumbered by hundreds of walkers. I guess Rick forgot. Just find the nearest incapacitated one, or dispose of one, and proceed to smear the guts all over yourself. Hell, Michonne even managed without the messy face paint by just herding a couple with her.
And there doesn't seem to be any danger of walker blood and fluids splashed all over you, when even a small amount can seep into your eye ducts, nose and mouth and ears, let alone any small cut which in the ZA I'm sure a few at a time would be quite normal. So if its all safe an all...MUST SUSPEND DISBELIEF.... why not use the method more themselves?
Create masks and waterproof outfits they could smear with fresh zombie guts when needed. I'm sure it does reek, but it could be used for emergencies, or to take along on runs, just in case. If they were smart, a well prepared group wouldn't have to really worry about walkers, once they'd secured a fortress of some kind.
After they opened that plot device up it took a lot of the threat away, and the suspense factor in the series. I don't particularly like that it became more of the same old "humans are the real monsters" plot line, and that Kill and Cover method made the human threat that much more threatening in comparison.