I don't necessarily have this issue with sewing/quilting but certainly do with household paperwork! I had such a pile of stuff going that I was totally overwhelmed and getting absolutely nothing done. I finally decided I was going to spend 1 hr./day working on those things. Let me tell you, after 2 weeks, I had most of it totally under control. You could apply the same principal to your ufos. After you get them organized as ckcowl suggests, you could spend a preset amount of time working on the finishing baggie #1 and so on.
When I get in my procrastinating mood about much of anything, I'll eventually make myself do x amount of 'work' before I allow myself any 'fun' things (i.e. - fold laundry, then I can sew). Just what I have to do or my life would be a disaster.