You get a permanent parking pass, but you can never remember where your car is parked.
You know what all the codes mean on the hospital public address system, but only pay attention to "code grey" or "code red".
The kitchen staff at 4:30am starts making your usual when they see you come up to the order window.
You know where the good bathrooms are, as compared to the ones used by walk-ins off the street who are not visitors or patients.
You can start ranking nurses and identifying favorites.
The nurses start sharing with you their impressions of the various docs.
You know enough to avoid the hospital cafeteria for dinner. "Natural" does not mean free range, organic, or free of hormones or antibiotics. Broccoli can be cooked too long.