I've never refused a crusade without getting instantly excommed, regardless of where it's going (and I usually play GA mode), even if the Pope's my ally (I've had him excommunicate me but break his alliance with the crusading faction since the two of us went to war).
I try to move my important troops out of a crusade's path and then let it through, but sometimes I don't have that option and the excommunication is less damaging than the crusaders would be. Very annoying if I'm trying to be a good Catholic and my neighbors insist on sending crusades through my lands over and over.
Ajax
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