That was: an office with a door, and a big open space where people from a kind but competitive group had free-wheeling discussions.
The main thing was that we together were shaping the product; if you convinced others, you could have an impact. And to convince others, you needed to do your homework (in your office).
So it's not really the office or the desk but the rhythm of coming up with an idea and seeing it take root in your peers (or not) -- the opportunity to contribute.
Nowadays, it's open desks or cubes and product managers, and any collective discussion is shot through with politics. When initiative is squelched and mutual respect is replaced by influence, the only thing to maximize is slack -- which makes working from home the absolute best.