Vision, hearing, touch, taste and smell are all key to our survival. Without our five senses, we'd roam this Earth aimlessly and for a very short time, eating poisonous plants, slamming our heads into every door frame and undoubtedly stubbing our toes on every coffee table, too.
Because zombies are perpetually disintegrating, it's difficult to understand how they'd perform any of the vital actions necessary to hunt yummy brains. As they began to rot, the soft tissue of their eyes would be among the first organs to fall apart, leaving zombies grasping blindly for anyone unlucky enough to wander into their blackened hands.
Their eardrums would warp and tear and fall in tatters, as would the rest of their auditory system. Deaf and blind, zombies would then fall back on their sense of smell, which would likely be overwhelmed by the stench of their own organ meat stewing inside their gut sack.
That means zombies would need to feel their way through the world. In large numbers, a few would certainly nab victims from time to time, but fully functional humans would be able to avoid these monsters in most situations.