Being sick oneself is bad enough, but having been through the nightmare of a critically ill child, I learned the hard way that you damn well better arm yourself with knowledge when dealing with the medical profession -- for your child's sake.
The idea of patients filling out the questionnaire on line is appealing, as long as the patient also has access to the results, since I doubt many of the doctors I've met would bother to read it.
As far as hypocondriacs go, there's plenty of online info for them to drive themselves nuts already.