I agree with this post in general. I have a MBP 1.83 GHz model from work. It is a fine machine (other than a bit of high pitched noise from the CPU when idle... but not sure I can give it up long enough to get fixed).
I would say that the Core 2 Duo really isn't the biggest thing about this new model at all. For me, the ability to add more RAM would be the biggest thing, then the addition of the FW800. If you don't need those two things, then I don't think the Core 2 Duo is anything worth crying over. Sure, its a bit faster (probably not nearly 30%+ that Apple is claiming when you get to real-world tasks... and remember that is with increased GHz too.) The 64-bit in a laptop is going to be irrelevant to 95% of people at this point.
Sure, I always like to have the latest and greatest.... everyone does. But, I'm guessing most people will be hard pressed to tell the difference in the CPU. The ONLY time I really notice the difference... even between my PB 1.33 and my MBP, is when I'm doing something like a 3D rendering, and time it. For most use, they both are pretty fast.... and there is a MUCH wider performance gap there... like several times... not just a few percent.
The ONE big thing I hope they fix in the MBP line before I buy one personally, is the max open angle of the display. The MBP is the only computer with as limited of open angle I have ever used. I'm 6'1", but that is not THAT tall these days, and it causes me to slouch to get at a good viewing angle. I have never had this problem with other Mac laptops I've owned over the years.
But, outside of those things.... I don't think older MBP owners have that much to be jealous over.
-Steve