Ah, yes, everything true here, but as of right now, not the future, there is no big deal about 64bit.
The thing is, even in "32bit", SL runs many base system functions in 64bit. The "top" layer is then derived to 32 or 64, and this is due basically to coding.
So, in essence, and in broad general terms, a 32 bit app (even with "SL support") will always "cap" out it maximum performance beneath a layer of 64.
Even today's 64bit apps, you will not see a performance increase, like Safari or iTunes whatever.
Now, when big productivity suits appear, like Photoshop, Protools, 3d modeeling apps and achitecture rendering stuff... or games! damn I am waiting for theses to star showing up !! haha... anyways, yeah these guys will be able to harness the trues power of 64bit, be it in CPU math, RAM requirement and pushing bottlenecks in your system.
Add to this Grand Central, and surely you will feels a new era of home computing.
I've been running 32 and 64, for instance Fusion only runs if I boot 32bit, and the OS is so responsive anyways, I don't feel any difference at all in any app whatsoever. Click on anything and before my eyes get to screen center, its there already. Absolutely amazing. But, having this said, I dont understand WHY Apple is making almost its entire line to boot in 32bit, except servers and I think the big quads. Surely for compatibility reasons, but the way its going, in no time at all 32 bit will seem prehistoric.
Personally, I can hardly wait to be able to have 8Gb ram filled with drum samples
