There is immense potential for creativity in ANY field — medicine, law, SWE, you name it. There are not many creative people.
Curiously the MDs I work with have been relatively unanimous about this: there is a variability in cases and you do, in a way, have to be "creative", but in a very limited sense of what that means. "Creative" in your analysis. Some thought that was a boring aspect of the job, some thought that was the whole point.
What kind of creativity could you demonstrate in the OR?