Almost every pianist who can play hymns in The Church of Jesus Christ of Latter-day Saints will at some point be invited to be a ward organist. Unlike many church organists, this responsibility is unpaid and often comes with little training.
Although I learned to use the foot pedals in my college organ class, the coupler button has become my best friend as I play the organ for church services! It allows me to play the organ much like I would the piano but transfers the sound of the bass line to the deeper foot pedal stops for a richer sound and a less stressful playing experience for me since I am not an organ foot pedal pro!