My post shave routine:
Cold water rinse.
Rub face with Alum Block.
Let it sit for a while and clean out my brush.
Cold water rinse.
Thayer's superhazel
Aftershave splash

I never skip the alum block. I agree that it has some antiseptic properties and is a good nick closer. Maybe using the alum, witch hazel and AS is over doing it, but it's become a habit and it works for me.