After practicing NVC a fair amount (it is a /practice/, not a tool), you can literally start feeling your brain re-wire in a good way. You stop feeling so much responsible for other people's emotions, even if they are about something you did or needing to put your needs in contrast to someone elses, you start automatically being able to empathize with someone's feelings, even when they might scare you, and perhaps most importantly your own self-talk and the way you relate to parts of yourself that "you" are in conflict with starts to change.
At this point, there is much less robotic phrases. In fact, watching someone who has many years of experience rewiring their own defenses through NVC practice responding to difficult situations seems near-magical because there are so many less ego defenses to get stuck on someone elses ego defenses so really difficult and hard things can be cut through like better and both people can feel heard and understoor.