Many nurses who apply for insurance jobs have only had one to two years of experience at the time they applied. So don't feel bad about being a five year nurse. Your years of experience would be enough for most insurers. Your post indicates you have multi area hospital experience which insurance companies look for. You also have that all- important "anal" quality that may help you move through the ranks if you find insurance is your niche.
The size of the insurance company you work for and the number of subscribers will determine how hard you work. I worked for a pretty good size insurer a while back, and it was rather hectic for me. I worked in what is known as preadmission certification. This is the area that many nurses are hired into initially. It also may be called utilization management as in the hospital. This area will determine if you are cut out for and stay in insurance or not. You will make it or break in this area, because there is alot of information that is generated to be reviewed on paper, fax, or electronic forms. Also, you may feel pressured to help control costs that you did not consider when you were at the bedside. That is uncomfortable for some nurses. I got out, because I missed working with the patients, and I was not sure I enjoyed seeing services denied as well as providers lying about patients' conditions. I went into home health, because it put me closer to the patient and the environment that contributes so much to the patient's well-being. In this area, I spend a little more time discussing, instructing, teaching, and supporting.
Back to insurance. I did find insurance interesting, however. I got to look at health and medical care from another perspective. I realized after working in insurance, that the insurance company is not always the bad guy. I think starting salaries are equal or better than in hospitals. I think that if you work for a large insurer, your opportunities are wider, and your benefits may be better than the hospital. Also, it's nice to be able to work that 8-4 or 9-5 with no weekends or holidays and not have to take any work home with you unless you want to. I think if you really want to get into utilization management, which includes hospital, insurance company, or some other setting, now is the time, because you seem ready. Perhaps you will find that this area will work for you. Best wishes.