I think that will be a very personal thing.
For me it was bliss. I had decided I wanted to be completely NC a long time before it was practicable to make it possible due to living in a small town.
Over the previous few years my brother had been arrested 7 times for either causing a disturbance at my home, making threats or (twice) physical assault. Every time he was arrested the other siblings would get on my case about it.
One lived in the next street. One lived a ten minute walk away. The other lived further away, but worked in the main supermarket in town. I couldn't relax at any point as the chances of seeing them was constant. We were also dealing with a family member's estate so they were able to use that to make contact.
Moving away meant peace. I wasn't going to bump into any of them. None of them knew where I was. I could go to the shop and not be in fear. I could open my front door when the bell went without having my phone in my hand ready to call 999. I could take my kids to the park and not have to say "Right, if we see X, Y or Z this is what we'll do..."
It absolutely was, and is, bliss.
But the key perhaps is that I was long over the relationship and it's losses long before the NC was actually possible. There was no sadness, just sheer bliss at being free.