Relax, I have nothing against the rosary. This is a different question.
How do you feel about praying the rosary with a cd or in the car? For instance, right now I am folding letters for a mailing for my job. My mind is about 10% occupied because they go in the envelope in a order, maybe 5%. While it is best to give full attention to the prayer would it, in your opinion, be okay to say a rosary or divine mercy chaplet even though my full attention is somewhere else?