I'm in the non pre-wash group. Mostly because when I decide to get started on something, I want to start right away! I use color catchers in the dryer and have never had a problem. I've made red and white quilts, black and white quilts and bleeding hasn't been a problem. I do understand the concerns about chemicals, but this is something I have never worried about. I like working with the fabrics before they are washed.
I do love how the people on this board can say what they choose to do and why, without denigrating others. Other forums and boards that I have been on in the past have not been that way. That is why this is now my "GO TO" Board!