I like an open plan too. With the right people (who aren't loud, and who still know how to be polite about interruptions), and the right floor layout (minimize foot traffic near where you sit), it can be a great environment to work.
I worked at a company that moved from a one-big-space office to one with lots of individual offices. It drastically increased the siloing of various teams; I think we had much more camaraderie before the move.
I haven't yet seen any decent research which proves one way or another whether an open plan helps. What I have seen, is some pretty flimsy and inconclusive research that people often quote as "overwhelming" evidence against an open plan.