Well for some like me the water (snow melt) is more annoying (way more) that dirt...
I often go in the garage as our freezer and extra food are there. With regular flooring, its just a mess of snow and water pooling an then going to the center drain. Every box, shelving or metal item that touches the floor gets rusted and disgusting.
When the snow and dirt falls in chunks from the truck, it splashes all my stuff near the truck.
With freeflow the floor is always dry and you can walk on it without wearing shoes every single time.
For me that's much more important than the cleaning process.