We kept the same cabin, so we didn't have to pack up or move anything. We did get off the ship for about an hour, but they did escort us back on before they started letting everyone else back in the terminal.
If we were moving staterooms, we would have had to pack up, but they would have moved our luggage for us and we should have been able to get right back on again and into our new stateroom quickly.
If you choose to exit the terminal to go do something in the area that day, you do need to wait for normal boarding times to reboard the ship. Also, staterooms are blocked off from when standard boarding starts until 1:30, so during that time frame you are either in your stateroom, or out in the ship with everyone else.
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