That's right Ryan, many airfields have disused runways as taxiways, although it sounds impossible to do it does happen, many airfield briefs have information regarding locations of nearby disused airfields, new runways under construction, etc....all help to improve situational awareness....
however, as has been alluded to in previous posts, its a team in the flight deck, if something doesn't look right it probably isn't, i'd rather say something and it turns out my fears were unfounded than say nothing at all and let things go horribly wrong....
never say never, it can always happen to you no matter how good you think you are