I wouldn't even say its less effort. Its a whole different kind of effort. A social neurotypical person willingly engages in interactions and "masks". A person on the spectrum only engages because they have to.

For me masking at work is more boring than it is effort. Most coworkers i've encountered are so plain that the moment you start discussing something personal that isn't the most sanitised hobby ever they get funny. Tell them you spent the weekend at an illegal rave or getting drunk at a furry convention and they start to freak out. It's no effort to not talk about this but it also means there's basically nothing to discuss.