You won't get autolysis from long term aging on the yeast cake, per se, but you will get some stale flavors.
Anything I planned on aging more then two months or so would definitely go to secondary after about 3-4 weeks in primary.
Primary #1 - Midnight Ryeder (Midnight Wheat and Rye)
Primary #2 - Florida Weiss
Primary #3 - Kane-DOH APA (Honey Citra APA)
Secondary #1 - Downtown Flanders Brown (brewed August 2012)
Keg #1 - Raspberry Florida Weiss
Keg #2 - Cinnamon Raisin Cider
Keg #3 - NONE!
Bottled - NONE!