I think DBT is great and I hate, hate, hate groups. I give my current facilitators hell

But, I go because I get something out of it. This time around I get support in the sense of routine and a reminder with regards to the skills.
DBT can't cure me because my depression isn't situational/circumstantial, it's biological and until I get a medication that works, I have to cope. What it *does* do is keep from making things worse and, honestly, has taught me how to interact with what I'm experiencing in a way that is consistent with the person I want to be.
I've found that the group is more like a classroom, mostly skills learning and discussion. There's not a lot of self-disclosure except to talk about how we practiced our skills that week (mine is a weekly group). There are strict rules about discussing suicidal and self-harm (for us, we say "target behavior" when discussing our individual issues within the context of group). The heady stuff is handled in individual therapy.
I'm happy to answer questions about my experience. I went through it about six years ago for the first time and I was a mess in terms of coping skills and emotion regulation. I had a breakdown and was barely functioning and by the end I was functioning again, enough to go back to working a full time high stress job.
So has it helped? Really helped? Yes. I would say that it has.