Surgery is cutting an incredibly complex meaty system apart and then sowing it back together. I don't believe for a second that there isn't anyone who finds that fun.
Probably a terrible idea to tell the patient that though.
Given the choice between a brain surgeon who gets a similar kind of enjoyment from it is as I do coding, and one who finds the whole thing tedious and uninteresting, I'd prefer my chances with the former.
Although I'd hope they are a much better surgeon than I am a coder.
Just because something is fun doesn't mean it is trivial.