I do use the tracking. I've had problems with stolen packages so I want to know what day it will be here. I have started having things shipped to my work. Just last week I checked the tracking on something and saw that it was delivered at 10am, it was 2pm and the mailroom hadn't delivered it or notified me.
I went to the mailroom and there it was, sitting on the counter. It would have got to me eventually but, who wants to wait an extra day for fabric??