I did laundry on both our 2012 and 2013 trips. Our 2012 trip was 9 nights at Disney and, our 2013 trip was 8 nights at Disney and two nights on the road. In 2012, we stayed at All-Star Movies. In 2013, we stayed at Pop.
I travel alone with my 2 children so I wasnt sure if Id be able to do it, so in 2012, I packed like I wouldnt be able to do laundry, but planned to try. I was able to get any change I needed in the laundry room using cash I had. I think the machine took $1 and $5 bills. I did go to the front desk to get the small bills from the $20 bill I had. The laundry room also had detergents. It was $2.00 to wash a load and $2.00 for 30 minutes of dryer time. It was easy. The laundry room there was right next to the childrens splash area, so we spent the evening out by the pool doing laundry. Looking at various maps, the laundry room seems to usually be near a pool so that helps.
In 2013, I planned ahead to do laundry so I packed those Tide pods and packed significantly less clothing and it worked out fine. I didnt do it half-way through. I did it our last night in 2012, but in 2013, I did it with 3 days left in our trip. For me it depends on our touring schedule. I do laundry when we have a short park day during the 2nd half of our trip. I drove in 2013, so I meant to bring on of the kids fold up hampers, but forgot it, so I just got a couple of extra laundry bags from the front desk.