About 3.5 feet. Tall enough that you can't see each other when you're sitting but low enough to see everyone when you stand up. We moved here from 2-person offices.
5' tall but I can see out of windows on two sides since I'm on a corner.
I don't care about being in a cubicle as much as I care about sitting down all day :-(
The older I get, the more restless I become. Even though my wife has to deal with weather extremes in her job, I'm beginning to envy her!
It sucks, but not as bad as open plan.