The linguistic diversity in NC is really fun if you're into that sort of thing. Hoi toider is quite unique, but after having traveled and met folks from more parts of the state, it's obvious that there is no single "southern" or "north carolina" accent in general. Appalachian, piedmont, and eastern accents all have noticeable differences - and hoi toider is very unique, but I don't meet many people with that one. Now that so much of the state revolves around cities with high influxes of out-of-staters (Charlotte and Raleigh), accents are less noticeable even for people born and raised there. But differences are definitely still there, just far more subtle.
One thing I noticed from looking at the data for the accent quiz, is that North Carolinians are far more likely to NOT say soda/pop/coke in actual conversation. We just use "drink" for everything. I attribute that to the fact that sweet tea still seems to be the most popular beverage. It was the only place on the map where I saw that particular quirk.