You're faster? You don't Have to be. Let's say a "vehicle breaking" -mechanic. At the moment, that wouldn't matter a bit, as there's no threat anyway.
The juking, avoiding combat, or meticulously killing everything on your path, while making your way to your destination is exactly what is missing to make the world feel Active/Alive/(undead?).
Being able to just run around every zed on the path is "just" a design decision.
And just the look of the place.. this is marketing material from the steam page (direct link, I hope it'll work) :
Yes, they're all AI off, idling, manually placed there for the photo-op; but it does show that at least someone in marketing thinks there should be zeds in a zed world...
That's about 30 zeds (dense cluster at the bus), normally you might be able to capture 3-4 in that kind of a pic.
I'm not saying I'd want that image to be the norm, that looks like a tough time - but I'd rather that, than the emptiness of the world.