I think it can help. Are you a medical assistant in a single venue? Does that physician also see patients in a different venue such as inpatient setting, nursing home, free clinic. What portion of the doctor's day don't you see such as time spent with phone calls, charting, attending continuing medical education (CME) talks or completing CME online? What's the whole day look like from beginning to end? Does this physicain do procedures in the office where you assist? If not, it might be useful to shadow someone in a procedure-heavy specialty. If it is just procedures, all-day, every day, it might be useful to shadow someone who does almost no procedures such as peds. I hope you see what I mean about how shadowing can give you a broader picture of what different doctors do despite having substantial experience as a MA.