I pre-wash everything except jelly rolls, and I have only bought one of those and received another as a prize. The fabric still feels as nice to me after prewashing, and actually it feels better if the original fabric had too much sizing. I like knowing that chemicals from manufacturing are washed away, and that shrinkage and bleeding will not be problems with the finished quilt. As soon as fabric comes in the door, it gets washed. The only exception I make is for fabric that is scheduled for a OBW or Stack and Whack, or bolts of fabric (which get washed when a chunk is cut off for use).
I've read so many reasons why people don't prewash, but I think it comes down to the fact that they don't want to spend the time washing and pressing before using the fabric. If they've never prewashed and never had a problem, it's hard to say that their process is wrong, but we read so many stories on this board of people who have had problems with bleeding or shrinkage, and we also read about the chemicals that are present in fabric causing health problems. I understand why someone who has a large unwashed stash would have a problem prewashing. I was fortunate in that I decided to prewash soon after I started quilting, when my stash was practically nonexistent.