My sister and I have very different views on this!
She and I have gone away many times, always for a week.
She always spends a good hour or so unpacking, setting stuff out etc on arrival and then a couple of hours repacking before we leave. I just live out of my bag/case and dirty clothes folded into a plastic bag when I take them off to chuck back in the case at the end of the week. Repacking takes less than half an hour. The only item I unpack is my "going out" dress, of which I only take one.
She thinks I am abnormal as "everyone unpacks!" I think its probably more like a 50/50 split and when you only have a week, time is of the essence so I prefer to use the time to holiday (made up verb of the week) than fanny about putting my knickers and socks in a drawer!
YABU - I unpack!
YANBU - I live out of my case!