I don't know if scary is quite the right word.
I think alien, maybe even eerie, would be more fitting for the sensation that someone would suddenly get when, after going how many years being a certain way, being perceived a certain way, suddenly they're another person, and people treat them in ways that they never would've treated their old self. Even if one were biologically neurotypical all of a sudden, what guarantee is there that one would be experientially neurotypical as well? Identity isn't so much formed by nature alone as it is by one's interactions with the world, and therefore feeling isolated and flawed all your life isn't going to be erased immediately by no longer having the thing that marked you as such.
In this way, a cure could be jarring, even harmful for me in terms of forcing me to redefine myself as I am in relation to the world, and would instead only be helping the people around me so they knew how to deal with me. And since it's my mind and by extension my life on the operating table here, it's not worth it.