Well D&D is more outre than the typical fantasy novel. There are a lot more monsters per adventure. A lot more magic items. In short, D&D is more wahoo than most, maybe all, fantasy fiction.
Right. I don't disagree, but the OP started to define what he meant by wahoo. I don't see how your definition answers the OP's original question.
In fact, he used the cantina scene from Starwars. Now I don't exactly know what made him choose this example, but the cantina is not some remote dimension or 10th level of some dungeon. It was a place that Luke drove to from where he lived. Luke lived in Eberron apparently.
There are more monsters and magic items in DnD than there are in Western or Romance novels as well. If you define this broad enough, you can then (rightly) claim that there are no differences between Greyhawk, Eberron, and Dark Sun in how they treat wahoo elements (compared to a Jane Austin novel or Wagnerian Opera). This may be true (from a strange perspective) but is not useful IMO. You could argue that the Earth is more similar to Mars than it is to Jupiter, but you could draw misleading conclusions from that.