What is Hive to you?

My dream job.

How do you use it?

I mostly post splinterlands related content. But I also sometimes post my Let's plays or my book.

How many times a week do you post?

I post daily at least one post. I aim for two posts a day but sometimes I fail at achieving this goal.

Is it still more or less like it was back in the old days... "All about community!" ...?
If so, should I join one, or start a new one?

Yes. Since you are an artist I would really recommend to participate in splinterlands art contest.