I believe many of these warnings about "Made on equipment shared with" are there primarily to deflect lawsuits. I am not as worried as some people are about the dangers of cross-contamination.
I buy and use products labeled with these warnings as long as nothing listed in the intentional ingredients is problematic for celiac disease.
I realize that I run some degree of risk by eating foods with these warnings, so far it either has not harmed me, or at least I'm not aware of any harm.
I understand that some people are far more sensitive to very small traces of wheat or gluten, and I would not criticize them for using greater caution in their selections.
As cases of celiac disease go, I seem not to be as badly off as many others with this condition. When something does trigger a reaction in me the worst of it is over in a few hours, and no harm or difficulty persists beyond 24 hours. Some people have much more dramatic reactions that lay them low for days at a time.
This seems to be very much a gray area, where reasonable people might well reach different conclusions. It all comes down to a risk/benefit evaluation. I'm not prepared to give up all of the foods that carry this warning, so I choose instead to face any possible problems that may arise because of my choice to ignore these warnings.