I earned my title, but do I care?
To be honest I use my title on my credit cards to confound shopkeepers (I am hairy, stocky and tattooed and resemble a homeless person).
I do not use my title of Dr. at the "Doctors", I use Mr.
I do not use my title of Dr when I meet people (either service providers or socially), I use Mark, which is my name.
I never use my title on my passport.
I always use my title around conferences and at the university where I work. That way people know who to talk to about stuff.
I sometimes use my title if I am being fucked over (i.e. a legal matter, or a shit service provider etc), as somehow they think it makes me more respectful to have a D.Phil, but only if I really think they are in the wrong, otherwise I am Mark.
To those who try and devalue those with doctorates, I have published a number of papers on medical research which may go towards helping understand disease in the future, although as I research to such a fundamental level, any practical applications will probably be researched by a medical doctor (who will then take all of the credit).
I do not know everything about biochemistry, but I obviously know more than most people in the world about the particular sub-field that I research.
I do not think that i am better than anyone else, but to say that someone with a Ph.D is someone who stayed on at school longer is moronic. At least in my field, the people offering Ph.D studentships are highly selective. If you doubt this, or like one or two of the posters here seem jealous, please feel free to go and get your own one if you have the brains and character to do so. It's tough, exhausting, demanding and financially crippling work. I earned this, and all of my training took a year longer than a MD.
As we have a med-school at the university, I sometimes have to help teach med students some of the more demanding aspects of their field (like biochemistry). I am surprised how many of them can't even distinguish Moles from molarity or calculate pH. Most of them are just hoorah henries with the right parental income. We got here on merit alone.