I don't think you missed a trick here!
The only widget that is similar on the Overview page is the actions widget - the Activity stream "widget" is the next evolution of the actions widget on the overview page.
Creating a widget like the one you need would be fairly straightforward.
See my Some Quick Wins with the Managed Snippets Plugin, Thought I'd Share! for my activity widget implementations using Managed Snippets Plugin, in the next version of Jive we will get rid of this implementation in favor for the out of the box experience.
Doing a fly by, but seems to answer the question. If not, let me know. =) Hope it helps! =)