Sorbet is the only way I can function in anything larger than a 10 line script these days. I’ve started adding it to personal projects because it makes revisiting them later so much easier.
Without the LSP implementation out in the open, though, sorbet is just a type checker. It's not made much for sense for me to start integrating it into my personal projects just yet, since I only get the benefits when I run tc manually. Once Stripe opens up the LSP, however, I can see it gaining widespread adoption.