I don't think it matters what you do for a living. I have worked in IT my whole life as a developer, manager, tech support, training, etc.
Going through treatment, I kept thinking I should have been a doctor... that the doctors treating me and many others were doing something so much more worthwhile than what I do, or have ever done.
I finally said that out loud to someone and their opinion was that no one can know everything, so we need the diversity of skills that we all have.
I agree, but part of me still regrets not being a more engaged high school and college student.
For me - I want very much for the people I work with to again depend on me the way they did pre-cancer. I get this 'don't over work Mike' attitude like I will never be healthy again. I was almost to the point of believing people really thought I was 'back' - then out of no where I had an emergency appendectomy (just last week). Piece of cake compared to everything I went through last year, but it re-engaged the 'Mike's not well' mind set at work again... Very frustrating.