A second opinion comes after services are rendered. I don't think you put your doctor through a ringer like an employment candidate, was the point I was making.
No I do though, although the context is of course different since I don't know a bunch about medicine.
I ask a ton of questions and I've found that good doctors a) welcome the questions and b) do a good job of explaining. If q doctor doesn't really give me good answers then I'll go elsewhere. A lot of doctors appointments are ahead of some bigger procedure or an ongoing relationship, so the first meeting definitely is evaluative for me.