For me, the real difference is every patient's response - some (many?) doctors treat the job as a job. For me, this is a calling. I'm there to help every individual (in my case, in the emergency department). So every interaction is unique because every patient is unique. I go through roughly the same questioning and physical for most patients, but the interaction, their responses, how we get along, etc. is always, always different. I could see two patients with the same exact problem and do the same exact things, and take away two completely different experiences.

To analogize to computers, its as if you ran the same program on different computers and got a slightly different result each time. Or perhaps that each terminal responds slightly differently. Though I suppose in those contexts it'd just be annoying/frustrating... it's not a great analogy lol