In a way it's true. Nurses do a lot of jobs doctors traditionally did. Nurses perform many examinations and administer drugs regularly. They also tend to see patients more often than doctors in a hospital setting.
I was fairly aware of this before becoming a medical student but in my placements I've never seen nurses being contempt. I've sort of seen doctors leading teams and managing the patients' treatment. Patients' care may be done by ocupational therapists, nurses, physiotherapists etc. but we're the ones who help the patients come a to informed decision about what they want from their care.
And in GP surgeries nurses often do jabs etc. but we take histories, determine correct drugs to give and from what I see nursing students do they seem to be much more competant at their clinical skills than I am. I'm really glad that they're taught well but if I ask them why that is being given do you think they'll know the details of the underlying condition and since medicine isn't always if x happens do y in reality it's the doctor who has to investigate the underlying problem and present a solution to the patient.
That is our niche and that's what I love. The element of problem solving with huge risks yet huge satisfaction.