I do carry mine and use it however...in the ED where I work I think a nurse could easily get by without one. A patient comes in SOB, the med student, resident, and sometimes attending physician listens. A patient gets a neb, those are administered and charted on by RT. ET tube placed, the med student and docs are again listening. Plus the patients are all getting CXR's. They want to order fluids on a CHF'er the doc does a bedside ultrasound to make sure they can handle the fluid and of course everyone listens.
I am sure if I didn't use my stethoscope on a patient there would be 5 other people who did but I like to be in the loop.