We had one doctor at a hospital where I worked whose dictation was so wonderful we compared typing it to playing a piano. You just sit back, relax, and go. Fantastic!
And then there are others who have the long pauses, the constant changing of mind, the dreaded, "Transcriptionist, please go back up to where I said....". I had one doctor who added so many things to one report after he said "end" that I actually lost count - at about seven sentences!