sister, that is such a thought provoking question!
Without therapy, I think I would still be profoundly stuck in the marriage and would not have had the courage to move this far. I would still be miserable. Without therapy, I would still be depressed and barely functioning. Maybe I would have done something radical like leave all my problems behind by running off to another state. Maybe with my kids. Who knows. I think of my husband who was also depressed, but instead of going to therapy and dealing with his problems, he went to a doctor and started taking anti-depressants. This made him "happy enough" to stay in the miserable marriage longer. That, to me, is no solution. (Grrrrr, drugs!) So I am so glad for therapy. It has enabled me to really make progress on solving my problems.
Then of course there are the little things, like I've learned to trust another human being again!