A 2ghz processor will be way better than snap dragon. Its rumored to be using the nvidia tegra chipset which imo is one of the best. It runs fast, cooler, more efficiently, and uses quite a bit less power. And a true 2ghz would open the door so many different things to be available to the phone, assuming of course it has the memory capabilities to support it. But with the push of hd coming to these phones and the ability for video chat, the stronger processor will make it all run smoother and allow for higher quality. Particularly if while doing these things we have the ability to multitask, at that point you'd see the need for the processor.
Even if it boils down that the apps only open a second faster, some people will want that, or just another cool thing to show all the apple fanboys.. "hey watch how fast I can do this"