Do they crease at all?
They do a tiny bit but nowhere near as much as most shoes do.
Do people even walk normally nowadays?
Take a step and notice how your foot bends. That’s a normal stride and it’ll crease all shoes. Creases are normal and shoes can tolerate creases. If you want to avoid creases, walk like those stupid penguins. Better yet, just avoid movement.
I depends what you mean. The canvas ones will, just like converses or other canvas shoes. The leather and fake leather ones are real burly, and hold up to running/walking for about a year or skating for six months, just fine with no creases or anything.