I think it's good for acute situations and when you are basically not able to function any more.
But I agree that it is a fake world in there and it often is a huge shock having to come out into the real world.
My hardest stay was probably the last time I went in. I was about to have a nervous breakdown and had pretty much given up. For 3 days I was dosed on Geodon injections and basically just slept. It did help me tho to not have to worry about anything for those days. The next 2 days I then spent trying to find my feet