I have yet to make a pieced back, other than sewing a couple of seams to make the back large enough. I can't tell you how thrilled I am that more and more extra wide fabrics are appearing on the market so that I don't have to sew backings together.
Is this because I am burned out from piecing the tops? Do I hate the way pieced backs look? Am I lazy? The answer to these is no. (Okay, maybe the lazy thing is a yes.)
The truth is: As a (primarily) hand quilter, I like to have as few seams to quilt through as possible. It is just so much easier if there are no seams on the back to deal with. That's it.
Having said that, the quilt that I am now putting on the quilting frame (my own, not the church's) has a back that is constructed of two pieces of fabric. I will survive, I think!