I have been a nurse for almost 2 yrs and have been working in the medical ICU/Coronary Care Unit. I went back to school after the airlines went down the tubes.
I do enjoy my job. I like working just 3 12-hr shifts a week. It is a hard job though (and since I have only worked ICU, I don't know if it just because of the high-stress ICU environment or not). I never realized how much cleaning up of incontinence I would have to do. Nursing is rewarding though. A lot of times in ICU, you are really helping families cope with things. And for the cardiac patients and some of the younger respiratory distress patients, you do see them get better.
The rough part (emotionally) is the fact that we get a lot of end stage cancer patients or end-stage COPD people who aren't going to get better. Or people who are in semi-vegetative states and ventilator dependent who are still full codes. I am a real big advocate for quality of life and for allowing people to die when it is their time. There are a lot of family members who want everything possible to be done for their loved one without realizing exactly what that entails for the patient. That can be very stressful because sometimes it feels unethical to prolong this patient's life and suffering.
That being said, not all units are quite so intense and there are so many opportunities in so many different areas. The pay is good and the job security is amazing.