Just for interest's sake, here is the Australian Medical form
http://www.divemedicals.com.au/divemed.pdf. As you can see it is a great deal more detailed than the PADI/SSI/RTC/etc forms discussed here and also is done with an actual diving doctor.
So I have one of those that has been approved. I will continue to put NO to everything on any disclaimer form given to me by a dive operator and keep my dive medical handy. I don't think instructors or dive ops should be using their own forms to determine dive fitness at all, as they are not as thorough and have no medical knowledge (in general) and would stop some fit people from diving and allow other people to dive who are not fit. There is also the issue of confidentiality - whilst I am not concerned at all about any medical condition I have being public, many others are, for good reason and I am yet to see a diving operator/agency/whatever really address the issue of privacy. The shop I did my training with kept my dive medical on file where anyone could access it (I needed to get it back after I quit their club for my next club and some random staff member could produce and copy it for me).