I am not a pre washer either. I don't want to do all of that ironing. I just make sure I wash the finished quilts in lots of water and a couple of color catchers. I have even did this with a batik braid. As of now, no problems. I am not saying it will never. One day it probably will. I will have to live with the results.
Like I have said before, if I had to wash and iron all of the fabric before I started a quilt, I wouldn't make as many as I do and I sure wouldn't enjoy the process as much.