Music Theory is essential to all musicians. Regardless of what instrument you play, a solid foundation in Music Theory will help you become the best musician you can.
Some people, I'd hazard a guess most people, consider Music Theory a chore. If this is the case they may in fact ignore Music Theory all together. Some people even suggest that knowing Music Theory isn't really important and that real music comes from the heart. Well that is not entirely true.
It is true that the best music comes from the heart, but you have to remember that the heart and the head are not connected! So getting the sound in your heart, out for people to hear, can be rather difficult.
Music Theory is a language. It is a device for your heart to communicate with your head, to produce a sound that is uniquely yours. Take the time to learn Music Theory. It may take a little effort but you will be grateful for it!