If your boss is constantly pressuring you to take on more work, then burnout is not a career choice. Ever have a coworker leave and get all their work dumped on you? Do your deadlines no longer allow time to relax and explore new ideas inbetween them? Managers all read the same magazines/blogs on how to get more out of their employees and it always seems to come down to beating the employees until they die, same as in the slave days. If you're not being pushed to do more, consider yourself lucky and stay there!