The less happy side of the symbol: that amazon really didn't care about employees was reinforced in other ways as well. A common refrain from Jeff: if you're not happy here, leave. Life is too short to be unhappy.
In some senses that's a bold answer, and an honest one. But note that the answer was very, very rarely: what can we do to make life better here?
The door desks were also a symbol to us all that if you wanted to work at a place that cared about your health, well-being, and happiness, you might very well want to move on.
But, to be fair, three counterbalancing factors held people there: hard engineering problems, the very real prospect of wealth, and working on a product that was very, very successful. I never heard Bezos give anyone the sugar water speech: he didn't have to. It was obvious that Amazon was changing the world.