You may disagree with the "it's just a job" idea, but it's hard to disagree with this idea:
Our time is finite and the relationships you have will be what is important when you realize you have a few months to live.
I've yet to meet the person who was told they were going to die in 6 months and tried to spend 100 hrs a week trying to get more work done before death. Almost without fail, they find people to spend time with instead.
I don't want to be too specific, but I found out today that my friend and co-resident died of cancer at 39. He was my chief when I was an intern, and played a large role in not only my surgical education, but my development into a professional. He was an extremely talented surgeon, and continued to work through his illness. He left behind a wife and 2 children. I cannot even begin to quantify his contributions to surgery, both as a teacher and as a practitioner....but, I have to agree with @jackshepard. As I contemplate his death, and feel sad about my friend, I can't wait to get home from my conference and hug my own 3 children, and it is hard for me to think about my upcoming busy week of clinics and cases with much enthusiasm.