To be honest, I don't use it at all professionally except I guess transcription or search engine summaries to point me to actual documents. I mostly come across it when a client makes a contract or legal memo on his own and sends it to me to review. If I'm drafting a lease or a trust or whatever, I already have forms that cover everything they need, have been used thousands of times, and can be easily tweaked as needed cuz I half have them memorized at this point.

I can't imagine using them for a court filing. Those are either so short that they're trivial or they require painstaking research, precision, and often citations for every single sentence.