Care to state your position more fully?

• For most part placebos don't do anything.
• Placebos make some degree of difference to how pain is processed by the brain (via ECG, not just self report).
• There is some effect on short term stress levels.
• If what I is read is correct the only actual physical ailments where studies suggest that placebos make any difference at all are those mediated by the aforementioned stress. A mild yet significant effect on ulcurs, for example.
• The reason we use placebos when we test stuff is nothing to do with the idea that our body has magic healing powers that we can trick it into using. It is far more to do with avoiding the problem of humans lying to each other and themselves in response to social incentives.

Or where you disagree with the above, apart from the first line? (I do warn that my actual position is a bit more nuanced - I admit the reality of the expectancy effects on pain, and find the theories about classical conditioning somewhat plausible.

I primarily disagree with that line---which you present as a summary. Making your thesis a lazy over-generalization really undermines your position (at least to those of us who take things literally.) I would likely agree with most of your 'nuanced' position.