I am Italian and I want to say that there is a cultural element to the yelling, as well.
When there was yelling in my house growing up, it meant that someone was being shamed, that someone was angry and out of control, that Bad Things were afoot. When there was yelling in my DH's house growing up, it just meant...breakfast was on the table. It was time to get in the car. The day's news was being recounted. HUGE difference in the context surrounding the raised voices.
So my DH does 'yell' a lot but he does not shame or berate or use yelling as a tool of intimidation. He just complains loudly or reports loudly about anything that causes him emotion, be it the person in the next lane who is trying to cut him off, or the coffee that spilled on the ground, or whatever. He *never* yells at DD. He does occasionally yell *at* *me*, but I can definitely go him one better.
It has been really hard to reprogram my brain to accept that yelling, while IMO never an objectively "positive" thing, is not objectively "negative" either. It's all in the perception. DD, interestingly enough, does not seem to perceive yelling as scary or even noteworthy enough to look up. Arguing, though, between me and DH - even if it's done in carefully calm voices - that makes her look worried. It's intriguing to me.
So, I think that *what* is said and the context surrounding it is really far more important than the tone of voice. That said, I do not yell (or I try not to) because for me it has negative associations, and I wish DH would lower his voice a few decibels. I worry that since DD is *not* growing up in Greece, she may come to feel that her father's tone is inappropriate and get stressed out when he raises his voice. I don't know.