We're hopping from ASMu to ASMo on our 6th day, I know Disney will take our bags for us if we ask, but I was wondering if it's easy enough to walk over there, then I'd rather do that, get checked in and take our bags to our room etc.
This map may give you a better idea, but some of the ASMo buildings are actually closer to the ASMu foodcourt than they are to their own. YOu don't even have to go out through the main entrance to get to the other resort as there are paths between the buildings.
Just be aware you need to check out of the first resort by 11am but your new room might not be ready until 3pm.
It will all depend how full they are and how early the previous guests leave.
You might be best to pack up walk across and check in early then leave you bags with bell services and go out and do something then come back later and unpack if you plan this a room is ready it will be a bonus