64-bit or 32-bit for the 2011 (spring) Macbook Pro 8 RAM 500HD?

I wanted to know the differences between 64 bit and 32 bit OSx I am currently running the latest Lion 10.7.3 on a 2011 spring macbook pro with 8 gigs of ram 500 gigs HD. From what I can read in the info it looks like it defaults to 32 bit automatically but I was told that I can hold down the 6 and 4 keys during startup to start with 64 bit. I would just like to know anyones experiences and what software it works better with. I usually run Adobe CS5.5 and it would be great to find out 64 bit will give it a boost. Please list pros and cons you know of..
Thanks..
Pete

It should be running 64-bit on its own with Lion. My 2007 MBP began running full 64-bit after I installed Lion.
Run the Activity monitor and see what the kernel is using. It should show 64-bit.

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