Has anyone trained their neck consistently for a long time? If yes, what benefits has it given to you?

I've been isolating my neck only for 10 months, and my neck has grown from 14 to 16 inches, while it may not seem much, the visual difference is significant enough. Aside from improved neck posture and being stronger at clinches in muay thai. I also noticed that I no longer feel any neck pain from sleeping in wrong positions, I used to get constant neck pain from sleeping in wrong positions because I roll around in bed a lot, but not anymore.