I took an international vacation last year by myself. Left the kids with my DH for a week. He had to juggle everything without me for a week, and I got some much-needed space and confidence.
I wouldn't do it regularly, but I've been married a long time, and I worry that if I don't do this every 5 years or so, I will gradually become unable to handle it, like my mother. It's better than therapy, and cheaper.