Please note that discussion boards on Fodors website or even (gulp) wikimedia are not dispositive.
Note further that even the esteemed wikimedia article linked above has the following list of exceptions regarding Spain [I will try to bold the relevant words] :
"The exceptions to the above statement are the following:
There is no illegal intromission:
In case of explicit consent of the concerned person (section 2.2).[100]
In case of predominant and relevant historical, scientific or cultural interests (section 8.1).
It is allowed to capture, reproduce and publish a picture without permission if the person depicted is a public figure[101] and the picture is taken in a public event or in a public space, open to everybody (section 8.2.a).[102]
It is allowed to propagate graphical information about public events or occurrences when the image of a particular person appears merely incidentally (section 8.2.c).
Later commercial re-use of previously published news pictures or public figures' images (lawfully released without permission) is not allowed without the consent of the person(s) affected (see Sentence 231/88 of the Spanish Constitutional Court, dealing with the death of the star matador Paquirri).[103]
Special rules apply to minors and incapacitated persons. If they are under a legal disability, written consent from a legal representative is to be obtained in order to capture or publish or use their picture, and shall be submitted to the local Public Prosecutor's Office for approvement (section 3 of the above law)."
I take this to mean that if I am at a holiday celebration that was listed in the newspapers or online by a public authority, like for example the Good Friday processions in Girona where hundreds of children are dressed in costumes and have been rehearsing all year to participate in the pageant, I don't need to get the consent of their legal guardian in order to take their photo.
If I wanted to take a photo of the pageant participants' sibling an hour later as they were getting back into their car after the festivities were over, that would be creepy. I think that's what the law is intended to discourage--not taking pictures of a parade or a choir or baton twirler. They all put a lot of effort into those performances, and deserve to be preserved and celebrated!