I just upgraded to FM 13. And, am I ever glad I did!
My app has had definite 'feature creep' where my main Dues Portal has gone from 700 px wide to 1200. That size is just too wide for many of my users laptops.
With FM 13 I was able to delete a net of 5 columns of portal fields (they were 'read only') and put them in a PopOver. Since most users will never want to see the contents, but for those who do, they can just click the green button and ba boom... there is the information. Kewl.