You had me worried. / You worried me.

BamtoriYou had me worried. / You worried me.

Teachers, what's the difference between them, please?

Thanks so much, Philip.

I heard that this kind of structure, "had sb pp", is to take attention from the subject (the doer of the action), and gives more attention to the action being done. Is that true in this case, and what does it have to do with it implying that there was no need for the worrying?

Yes, the expression has some indirection. It might be even seen more polite as a result.

Thanks Marius!

So the expression "You worried me" might seem too direct and

I think it would be highly unusual if a native speaker said "You worried me." It would be much more typical to say that 'something worried me.'

'You had me worried' is much more natural than 'You worried me.'
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