Moderate resorts will always be larger than values; so POR room is larger than All-Stars.
You can look at the POR thread to see the size of the rooms.
I have done 4 adults in POR and we were just fine. I would not suggest doing it in a value, unless you try POP.
For 4 adults, definitely bring or do the following:
Set up a bathroom schedule, who goes first, second, third. We rotated one in the bathroom showering, two at the sinks, and the fourth at the table getting ready (make-up, hair, etc).
Bring a surge protector for electrical hook-ups; you will have multiple phone chargers, battery chargers for camera batteries, etc.
Bring a shoe organizer for over the bathroom door and then assign a row to each person.