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It is very different stuff. I think synthetic has been covered well here before, but the oil is much more durable. The additive package tends to be premium to last as long, and it's different because of the inherent characteristics of synth oil. The base oils don't need as many modifiers to maintain viscosity or assist in cleaning since the unmodified oil is superior in these regards. That means much less risk of sludging or reduced lubrication should you go too long or have a "temperature event."
If you run in weird climates - really hot, really cold, or back & forth, or need extended intervals, synth is generally better than the dino equivalents. (not to say there aren't excellent dinos and blends, it's just that they'll tend to fail first in the worst situations) If you're in severe circumstances and you don't or can't stop, synthetic will be your best bet. Each car and driver is different though, so it's still flying blind without at least initial analyses. That means for most people you're right. At 3-5000 mile blind changes, synthetic is mostly Alpo for the car.
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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