Yeah, I've used it a few times. I really don't recall any particular songs, I generally try to feell my way out. Using a double pedal for 24th and 32nd rolls definitely can add to the excitement of any praise and worship song. I too use the double a lot on the "boom-tap" rythms. To me it just sounds right. I also use it to compliment different shuffles I use on some other songs.
If you really trying to find some applications for a double bass pedal in gospel you should definitely try and get Israel and New Breeds live DVD. Chris Coleman was doing some nice stuff on there. I hope this helps.