I counted my ps plus backlog (free and bought with discount). I have 12 full games that i haven't even downloaded yet because of 160gb hdd and so much other games installed which i am not through yet. Together with my retail backlog that makes about 25 unfinished games. And i tell you. It's not that i buy less just because that backlog. The ps plus discounts like 50 percent make me buy even more. I have to work hard on that games until ps4 comes out...
must-have-list for platforms i don't own yet:
WiiU: Donkey Kong
XBone: Dead Rising 3, Ryse