And oh goddess, its even worse in World War Z, lol.
All things given, the Zombie is the easiest and most preferable of the Apocalypses to survive. What always bothers me in zombie movies are the images of rotting flesh tearing apart healthy humans, when that isn't an easy task FOR healthy humans.
Depending on their level of rot, they'd tear themselves apart trying.
Also always wondered why doesn't anyone travel to the arctic? Corpses would freeze solid there, while you wait for them all to rot away, with the Inuit.