Your quilt will not fall apart because you didn't back stitch at the end of a seam. With quilting, almost all the time, you stitch over that part again. I have been quilting for about 17 years and have never backstitched and haven't had one quilt fall apart because of it.
You must be someone who has always stitched clothing, and then have moved on to quilts. Backstitching is what you do with clothing consturction, not quilts. You can, but if it's not necessary, why spend the extra time.
That's just my opinion.
Think of us in the northern part of Wisconsin today - we are expecting anywhere from 6 to 14 inches of snow in the next 24 hours.........I thought it was spring???