A 4.0 does give you a sense of accomplishment and bragging rights. It can get you noticed in this cutthroat job market. However, it doesn't give you any special privileges in the real world after you graduate (i.e., a 4.0 alone won't guarantee you a job offer, nor does it guarantee success in your career).
The "C=RN" mentality may have been fine for grads in 2004 but it doesn't fly nowadays with this job market. Nor does it fly if you want to go to graduate school to be a CRNA, MSN, NP, whatever. So definitely strive to do the best that you can in school. Aim for that 4.0, but if you don't get the 4.0, don't beat yourself up over it. It's not that crucial for success as a nurse.
I just realized I posted in this thread last year