Interesting question: How many companies who use open offices style floorplans have executives who still have their own offices? Maybe this is just another permutation of the out of touch boss problem. Nothing makes it harder to understand the downfalls of an open office than not working in one yourself.
We just moved into a new space with a six-person desk (rather nice) in a big bullpen, with two executive offices off the side. One exec gets the corner office, but his door is always open and he's always poking his head out to talk to us. He (like us) has mostly glass walls, and feels like he's in a fishbowl. He used to share his office with an intern, though, and I can hang out in there when I want.
The other two execs (CEO, CFO) hole up in the other office, and close the door, and don't really talk, and basically are just aloof. They also covered up all their glass with random posters and things, presumably because they didn't want people looking at them through the glass. Hey, suits! Developers don't like being in an aquarium either! >:-|
sigh.