I am a Med/Surg ICU nurse, but our hospital has a Trauma ICU to which I have floated many times. The trauma patients are typically younger and have fewer co-morbidities when compared to the MICU. It is a lot of pain management, neuro checks, and physical therapy. You see a lot of sad cases and people who have made poor life decisions, but that can be said about any area of nursing.
As far as gore is concerned, ER nursing sees way more of that than the ICU for the most part. And, just like anything else, you'll become desensitized over time as you are exposed to more blood/bodily fluids, incisions, etc....Maybe not 100% desensitized, but it will get better!