I find I only have that problem if the project is something I didn't want to do in the first place. That is why I rarely participate in challenges or Block of the Month etc. I just spent 4 days on retreat. I finished all of the projects I had taken. I was amazed at what some of the people brought. I realize that many of them work fulltime and don't have time to quilt like I do at home. I was the only one who had finished the quilt that was made from the blocks we all did last year for our 10th anniversary of retreating. On friday night we tour everyone's room and look at the quilt on their beds. At least three of the 24 of us had basted but not quilted quilts on their beds. Several of them have had the same quilt every year they come to the retreat. I always have a different one.
In general I don't have UFOs I just have lots of fabrics that I purchased with a project in mind. Once I start something I usually finish it.