I play weekly at a community church, and I do a little of everything.
A solo the 1st sunday of every month, in addition to a solo/improv during silent meditation and communion. I trade off with the organist for pre/postlude. I accompany the hymns as well, adding filigree on the last verse or two.
I have a friend who plays his Silhouette with a praise band, and he loves it. He also does some improv. acting as a keyboard or guitar.
I play for my home church in a variety of roles – as part of the ensemble with our contemporary praise band, using chord charts (the sound guys do a great job amplifying my pedal harp);