I've been using Fish as my login shell for more than a decade now. Unlike many other commenters here, I also use it for scripting. For simple stuff, it's way nicer for writing scripts because the language just has has fewer gotchas than bash.

If you're just reading instructions online, translating between examples given in bash and fish is trivial. I see people talk about that being an issue for them and I don't understand it; it's literally never given me trouble.