Seriously we never say "yinz" but even after being on the road for 20 years people from the Mon Valley still recognize our accent. We think that we sound fine. :-D
The largest persona sporting a SCRA'EHN accent is a man known as Steve Corbett. He was a journalist for many years with the Times Leader Newspaper in Wilkes-Barre (near Scranton) and the San Jose Mercury News.
After he wore out his welcome in Cali he is now back home and has a daily three-hour talk program on WILK news radio. His father was an Irish Catholic Pa State Trooper known as Shamus.
His program airs Mon-Fri at 3pm Eastern Time. I can only handle about one hour before even I as local have to throw in the towel.
I usually dull my Southern (FL) accent down to where it's not all that noticable (I think) and the people out here (NM) at least understand what I am saying although not what I mean. With folks moving so much now, more accents will blend together.
Although when I get tired or have been around my kids, my accent does get a bit thick.
We North Floridians, being more the original 'true Florida', have a bit of an accent, though not nearly as 'rustic' as Georgia or Alabama. Having done a lot of traveling in ten years of military service, I have neutralized mine too.
How the heck did Louisville get on there? I was raised in Louisville, and there really isn't much of an accent there. In a lot of other places in Kentucky, you could cut the accent with a knife, but not so much in Louisville.
Now, I think there should definitely be an Alabama city on there. Their accent is thick and slow as molasses.
And the whole area around southern Georgia (Cairo, Hahira, Wigham, Thomasville, Boston, etc.) has a very pronounced 'southern drawl. Should be on any list of notable accents. That whole area is some sixty miles from my AO.