I work for a publicly-traded company and we use it quite heavily, though it's not the only thing we use. I've heard secondhand that there's a lot of AngularJS (aka Angular v1) out there too. Far more Angular 2+, however.
Pretty much, yes.
After Angular 2, many users switched to React or Vue.
Not yet, but it's getting close.
I work for a publicly-traded company and we use it quite heavily, though it's not the only thing we use. I've heard secondhand that there's a lot of AngularJS (aka Angular v1) out there too. Far more Angular 2+, however.