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I open carry in Raleigh/Durham and Cary (where I can) and have not had any experience that would make me reconsider doing so. However, I have not had to opportunity to carry in Greensboro at all. With what I understand about the open carry law, I would not hesitate to carry there, just familiarize yourself with the county/local statutes so that you know what limitations you are dealing with.
As the saying goes, "It is not whether or not the police know the law, but whether or not you do." I have read many accounts on where civilian carries had to educate the local police about the legitimacy of open carry in their area, either because they never experienced anyone carrying or they never took the time to learn that aspect.
"Carry often and safe"