I think most of the burn out comes from the 80-20 principle, where 20% of your staff deliver 80% of the output. I know where I work, if you work late and look around it is always the same handful of people who are working back. Usually its because they know so much about the organisation that people come to them to solve problems, and then they have to work late to do there own work.

I feel like if you are part of that 20% it can get pretty tiring, particularly if your personal life is also under pressure at the same time. (i.e. its hard to have quality relationships when you have to constantly work late).

I'm not sure if this feeling is universal, but I have a hunch that it kind of is. In terms of productivity, and organisational impact not everyone is equal, and those that are disproportionate in impact are put under increased pressure and stress during these times of efficiency and cost cutting.