Celcius really isn't that hard to get used to if you stop getting hung up on conversions and just live in it for a while. Faherenheit also isn't as hard to get used to as people meme it to be. It's all about what you've spent a significant enough time in to get the data points for how stuff feels to you.

Either scale would be second nature to anyone after a year in a new home. I made the change np. I never do conversion math, I just know what it feels like outside and can ballpark the number I remember having a similar feeling in the other place. It's really not a big deal and not worth all the internet yelling that goes on about it.