Yep, I am a clod as well - been a clod for over 30 years I guess
I do not yell anything, and usually people yelling 'on your left', 'slowing', 'stopping' or whatever else, kind of bother me. I think it is just superfluous and annoying, and adds to the road noise which is already more than enough.

That I recall, in Italy where I grew up we did not call anything either - we just rode predictably and safely in a continuous paceline, and no one in the team was ever yelling a thing.