Not crazy, just human.
I am taking a SIA A330 from Singapore to Brisbane at Christmas, and it crossed my mind that I’m taking the same aircraft type as AF447 across a stormy over-water equatorial region while no-one knows what caused the loss of AF447 in those circumstances.
As an aviation enthusiast and a very rational person, I was a little angry with myself; but I thought it just the same!

I think it is totally human to be somehow reluctant, but as aviation insider one should force oneself to take the flight irregardless of such considerations. There are other considerations that are totally valid: I for example recommend anyone not to use Turkish registered airlines as I see their miserable safety record and the common causes in all of the accidents.
For a time I would also have declined to use MD-11, as I regard them as not-so-good aircraft. However, the passenger version is operated safely by the two remaining operators.