Fantasyland will always be more effective because it is "fantasy" themed. All the flat rides in fantasyland are either a nostalgic look on amusement park aesthetics (carousel) or quite psychedelic (dumbo) or both. The rest of the lands at disneyland were more real-life adventures, and the break from tradition that cars land is is that it is both. While some think it isn't a big deal, it is worth noting that until dinorama, there were absolutely no flat rides at all 4 parks of walt disney world other than star jets and the fantasyland dark rides. Suddenly, every land is opening with them (correction; dca 1.0 and anything pixar (animation) related. It is a fairly major change. You don't see spinners in frontierland or new orleans square themed as trains, for example. The transportation attractions there are more alike their transportation references than a flat ride dressed as such; canoes, railroad, riverboat, sailing ship columbia. These are all far more real and effective and transformative than a flat ride dressed as x y or z.