I agree, but then again, I think this is a very provincial and regional thing.
I personally think that Yankees-Red Sox is the most intense rivalry in sports. But I don't expect people outside of New England/New York/New Jersey to feel that way.
I do think that the ten top rivalries in sports are (in no particular order):
1. Red Sox-Yankees
2. Redskins-Cowboys
3. Ohio St.-Michigan (football)
4. UNC-Duke (basketball)
5. Packers-Bears
6. Celtics-Lakers (recently renewed)
7. Red Wings- Avalanche
8. Nebraska-Oklahoma (football)
9. Dodgers-Giants
10. Giants- Eagles
I apologize if I left any out (I'm sure I did).
#2 and #6 get my votes.