At risk of injecting the perspectives of experts, it might make sense to refer to the CDC and WHO . . .
Ultimately, to vaccinate or not is a personal choice. Although my doctor did mention the Hep A, Hep B, and Rabies topics as raised by the CDC, I chose not to receive Hep A because it is generally low occurrence in Western Europe and my lifestyle is minimal for Hep B exposure. I figured rabies exposure was unlikely and could be treated if needed.
However, for my 2013 Camino, given that the CDC and WHO were tracking a spike in meningitis worldwide, and given that the Camino acts as a "mass gathering" for people throughout the world, my doctor recommended the meningitis vaccine. That made sense to me and I received it. He also mentioned the significant rise in measles in Europe (well documented by the WHO), he checked my immunization records and determined nothing additional was required.
I generally agree that a first world citizen travelling to another first world country, like Spain, the general advice of "do there what you do here" is reasonable. HOWEVER, the Camino potentially changes that because it attracts people from all over the world and artificially increases exposure risks that would otherwise be small (e.g. meningitis). Additionally, if one hasn't received standard recommended immunizations (e.g. measles), then one's risk IS greater.
At the end of the day, I am not qualified to advise a person to disregard the directions of his/her doctors or of recognized healthcare organizations. All I can do is make an (arguably) informed choice for myself.