I do have a favorite organist, though I'd be curious to see if anybody here has ever heard of him before?
Thierry Escaich. http://www.youtube.com/watch?v=Ulp9Tli2AZs
(A clip near the end of an improvisation he performed).
He's not only a brilliant organist, but a magnificent composer as well. Only problem is that I find it quite difficult to find many recordings of his works, and the sheet music to accompany them. However, I do have a few mp3s sitting around on my iPod of some of his compositions and some of his improvisations. The improvisations always blow me away, personally. The idea that someone could create something so structured and beautiful out of thin-air simply astounds me.
Can't say I've heard of this dude (possibly due the aforementioned lack of recordings/sheet music). Was that video an improvisation or a composition? I've always respected improv simply because it utilizes what one knows about music theory and directly links it to what comes out of the fingers (a skill I find myself sorely lacking in).
I saw this guy in concert recently, Peter Fennema. One of the pieces he played was one of Demessieux's organ etudes, the "Octave Etude". Anybody who can play ridiculous stuff like that and make it sound good gets high marks in my book. Possibly going further: anybody who can play ridiculous stuff like that and get people interested in learning more about the piece and where it came from, the circumstances surrounding its writing, maybe playing it someday, etc., gets high marks in my book. Sometimes you just have to ask "why?!" after hearing something played well.