If you're still feeling quite doubtful whether to go for responsive design or stay as you are, these guys will definitely change up your mind. In a brief and really informative talk they've managed to shove in the most important features of this design technique.
As you know, cognition comes through the comparison. Taking two blogs (one of them was responsive, another one non-responsive), they've explained why you need to make your blog or website responsive. Even though you think that you may know this even better than anybody else, for sure you need to see this video because of the way it was presented, i.e. the visualization is quite interesting. Go for it! Still, if you're not sure whether to make your blog or site responsive, guys from GigitalluLUX will give the right reasons in favor of responsive website design.