Well, there are many kind of atheists (many are spiritual kind of atheists). I for one, consider 'self-realization' very important, and see meditation as the path to it (if one does not think intensely and in a focused way, how will one get it?) . (BTW, I already have achieved 'self realization')
An atheists version of self-realization is different than my version of Self-Realization. In the atheist's version it is all a certain type of activity in the brain. In my Advaita view it is experiencing Sat-Chit-Ananda above the maya/illusion of 'I' and brains.