When we move from BCV to POR for our last week-end, I'll have the things you already mentioned in my bag. We try to do a breakfast on our moving day, then over to the new resort, check-in and maybe get into our room. If not, we either go to the pool or off to a park. When I've checked into anything other than a DVC resort, I've been able to get into my room by 1:00 or so. Of course, my bags won't be there, but it's nice to just relax a bit.
As to why anyone would want to move. If we go for more than a week, we likd to try out a different resort for a few days. Last summer we stayed at BWV for the first time, but didn't want to use our points for those high point week-end nights. So, we tried out the Contemporary for two nights and found we love it!!! Will most certainly be going back there. This coming June, we will be at BCV from Sat to Friday. Then on Fri we switch over to POR. Using Fri/Sat night points the first week-end but since we love POR so much (it was our first WDW resort!!) we want to stay there for a few nights, so tacked them on at the end.
It really isn't a huge issue to move. Disney moves your bags for you as long as you are moving between Disney owned resorts. They usually get to the new resort by mid-afternoon.