I don't think it will ever get it's "prime time" slot like it used to, but it's ticking over. I'm not sure how the viewing figures are in the states. There's a lot of competition over there.
How old are you Matthew if you don't mind me asking? I was 20 when ER first aired. I'd just got married and moved into my own place. That's why I can remember the pilot... cuz I'm ancient..