I've found Claude to be very useful when writing on the EA Forum. However, certain prompting and other techniques can help a lot.
The main use case I'm personally interested in is writing and interacting with content on the EA Forum / LessWrong and similar, but I'm sure there are other use cases that would be relevant to this community.
When having conversations with people that are hard to reach, it's easy for discussions to take ages.
One thing I tried doing is for me to have a brief back-and-forth with Claude, asking it to provide all the key arguments against me. Then I'd make the conversation public, send a link to the chat, and ask the other person to see that. I find that this can get through a lot of the beginning points on complex topics, with minimal human involvement.