One trick is to use a conch or talking stick. Whenever someone wants to do something in the game, they take the conch and announce it. If someone else wants to announce an action or interact, they take the conch and do so. It helps keeps people from shouting out at once.
Another trick is, if party members want to split up and investigate somewhere else beyond the current room, just say "ok, you leave the room" and end the scene for them. You can then finish up the scene in the current room without needing to stop, update the map, and describe a new scene.