My first job was in Corrections. I found the transition to the ER very easy after just 1 year of nursing experience in the prison. In fact, the ED is much more slow of a pace than the prison, relatively speaking, and my I swear I used way more assessment skills in prison than I do in the ED. However, I perform many more fun, in depth procedures in the ED and learn something new every day from the physicians and other nursing staff I work with.
EDIT: Prior to corrections I worked as a server which helped me manage my time. Now I think of my rooms in the ED as my tables at the restaurant and I'm delivering narcotics instead of food.