I'm in a similar setup right now - open rooms with 12 people per room. We have huge desks that leave plenty of space between each other and dividers separating desks that face each other. You only see another person if you turn 90 degrees from your forward facing position. We also have private rooms of various sizes that can accommodate one, two or five people if you need to be alone. Some of my colleagues use the rooms a lot, I personally rarely do. Overall, I really really like it, my experience mirrors your own.