If you have 32-bit apps that work fine, don't look for 64-bit replacements "just coz"
Oh I absolutely agree - though I di have this really bad addiction to having to experiment with everything!
So, in a sense, that's what I am doing with the 64-bit apps I am trying - experimenting! I did try WS-FTP (32-bit) alongside SmartFTP (64-bit) and have to say that SmartFTP was so much faster - in real and tangible ways. When it came to AB Commander I was not expecting to see huge speed or performance boosts as file managing is not exactly RAM or CPU intensive. That said I was impressed to find what appears to be a compact, fast and highly usable application.
a few programs (like photoshop, or other heavily memory intensive programs) could show a serious increase in speed if the extra memory can be put to use.
Absolutely - this was actually my primary goal and I have to say that the performance increase has been nothing short of spectacular! My workflow has been significantly speeded up - very obviously so with images around 400mb to 1gb range.
I haven't yet noticed a drop in performance anywhere with regard to 32-bit apps which has been surprising (I was expecting more 'glitches' and 'issues').
For anyone contemplating a move to 64-bit I would only advise it if you have a clear goal in mind - which I did. One reason is that while heavy duty graphics work will benefit you'll be disappointed in the number of apps that are genuine 64-bit coded. There is not yet enough benefit to be gained for an everyday computing experience. Maybe one day... but not now!