Yes, we do.
If you want to work well on the really large files that result from scanning LF film, then yes, you really do need 64 bit technology. I routinely work on drum scans of 5x4 color negative film as large as 1.5 GB RGB 16 bit, and I don't have any doubt that my (photo editing) life would be a lot better if Apple and Abode would finally get their 64 bit acts together and actually use the 64 bit hardware that's been available for years.
It's going to be one of those things that once you have it you'll be wondering how you could have gotten along without it.
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