Taking care of DNR patients. The point?

1 I work on a very busy Tele floor and can have up to 5-6 patients a night. What kills me...is when I have a patient that is DNR. Seriously? Like what is the point? So far, the DNR's are usually on their last leg, disease processed has moved to the final stages, yet you come to the ER with SOB, and admitted to my busy floor, and I have to now treat you as if I would treat one of my patients whose a full code - but, if you suddenly become pulseless, I cannot do anything anyway...grrrrrrrrr. How time consuming - why? I had a patient admitted from HOSPICE onto my floor for SOB - seriously?

Please help me understand you all. I am a new graduate nurse - 3 months - and when I get a DNR patient, I instantly get turned off. Sometimes these are the most time consuming patients with overbearing family members and in my mind I am like, the hospital is for saving lives if something lethal happens, I am not doing anything anyway. sigh.
You can't be serious