But as for music sheets with music notes, I can't play by that.  I just hear and I play.  All that being said, would it benefit me to learn how to read and write music to further expand my knowledge?
nowadays with recordings so readily available, the importance of completely knowing notation is nothing of what it used to be. there used to be no records, so in order to even listen to music, you had to buy sheet music from the store and play it on the piano. but nowadays, even in a professional setting, if you're learning material, even if you CAN read full notation, it would be actually very irresponsible to not listen to a recording also, because no matter how good the notation is, there's still layers and layers of depth to the music that can never be accurately represented on paper. it depends what kind of work you are doing, but in almost every modern professional musical situation, if you know chord symbols, (and the relative number systems are a huge bonus also), and have good ears to go with it, that's an A grade professional package right there. with the possibly the specific exception of the world of classical orchestral music. Also it may be different if your main instrument is a lead instrument - in that case you might want to know how to read melodies. And in general, i would recommend learning rhythmic notation, because often you will see rhythmic figures written in charts, and also it will be a very valuable tool when talking about the material with other musicians, you can refer to different rhythmic figures. and it would also help to know the names of the notes