It's easiest to see this in side by side charts. The magnitude of stock market losses and economic data was tracking almost exactly with the great depression, until the central banks intervened.
Global stock markets: https://cepr.org/sites/default/files/styles/flexible_wysiwyg...
U.S. Unemployment: https://obamawhitehouse.archives.gov/sites/whitehouse.gov/fi...
Global Industrial production: https://cepr.org/sites/default/files/styles/flexible_wysiwyg...
We're still feeling ripple effects from 2008, but things aren't nearly as bas as they could have been.