I see what you mean south coast. I agree on the fact that one can be very professional and efficient without being passionate. I'm not talking about performance.
I just wanted to say that "in my opinion", flying is NOT a common job. Pilots are generally passionate people and have generally chosen this job because they wanted it, and not because it was by chance. Having said that, a pilot who likes staying on the ground is, "to me", not a pilot in that meaning.
But I admit that my point of view may come from my previous job, fighter pilot. In this one, pilots had to be passionate, otherwise one couldn't accept all the constraints that come with the job.