Thats right. more you know, more tools you have to describe your feelings. I studied Music theory, Harmony and Counterpoint myself. depends on type of music you want to play if you are into Neo Classical like Malmsteen Harmony is a great tool. anyway when you love music nothing is better than learning more and more about it.
Some students asked Stravinsky years ago which university is better for music and he answered you should be born a musician!