Here in NY, if it is longer than a 6 inch blade, is a gravity, switch, or ballistic knife it is not legal, exceptions being used when hunting or fishing. The big thing they seem to focus on is if it is designed to "intimidate" when it is seen. Open or concealed makes no difference, it is not a weapon unless it falls into one of the above categories or it is used as such.
As too enforcement, as long as you are not being stupid, there is rarely ever a problem. I have only been questioned on the knife I am carrying by a LEO a couple of times. the main question I get is "Where did you get that, and where can I buy one?", which I answer honestly when asked. Most of the time, the LEO and I will wind up comparing EDC knives at that point, and I even have one that was offered in trade for the one I was carrying at the time of the conversation. Knife laws here are about as relaxed as the laws regarding where you can CC a handgun in this state.
If I have to explain why I ride, you wouldn't understand. Explaining sex to an alien would be easier than explaining the feeling, one that boils all that is going on in your life down to what really matters each time you are in The Wind. All I can say is, Life is not Life without it.