That's just to make sure you have a resort reservation and have booked ME, and they ask what hotel you're going to so they can direct you to the right line. you book ME ahead of time because they need to know from a logistics standpoint how many arrivals/departures are happening per day so they know how many buses and drivers will be needed. But once you get scanned in by the CM before the lines, you could literally go stand in any one of the bus lines and go to any resort.
The luggage would go directly from the plane to the cargo truck that picks them up and brings them to the resort, it never touches the ME bus. So yes you could tag your luggage with the ME tag and it will be delivered to the resort you are staying in.