You're a liar. You won't notice a difference between the 64bit kernel and the 32bit kernel. All of your apps will still run the same regardless of the kernel.
Ok, wow. I was not expecting that. I have booted into both and did notice a difference. Check out macperformaceguide.com and you'll see that there is a difference. Huge? No. Noticeable? It is to me.
To quote Christian Bale, "THINK for one ****in’ second!"