Great discussion and a similar point of view seems to be carried through, which is depends on the environment. Its not a one size fits all.
When we started there were 3 of us, there was no real division. As the company has grown a degree of structure was introduced at certain levels of growth. I've slowly attended less and less of the social events, but encouraging team effort. I refuse to sit in one of the offices, but camp out on the floor to keep an ear on all goings on. I have the meeting rooms when private discussions or calls need to be made. At our current stage this works well.
Unfortunately I end up more often than not eating my lunch at my desk which is a bad habit. Again I can keep an eye on things ensure we are staffed sufficiently to handle the calls.
No doubt more changes will happen again if we meet the planned growth for 2014. Would be great to look at this post in 12 months time to see what did take place and if any changes were made.