If that's really the most they can offer to 64bit users
Ah, I guess that again you have the wrong end of the stick. This was not an example of something enabled by the 64-bit version, it's just an example of how Adobe changes its story between releases. Illustrating that you can't believe what Adobe's developers tell you about the value of features their product doesn't have (well, this ought to be obvious I'd have thought). GIMP developers have been known to say that various missing features aren't important in the past and I didn't believe them either.
I still remember that Larry7 (1996) and Enemy Nations (1997) worked fine with Windows 3.1
and thus were quite happy with 16-bit system
I don't have Larry7 code to look at, but Enemy Nations is a Free Download these days. It's easy to verify that Enemy Nations isn't a Win16 game at all, it's a Win32 game carefully tailored to use the subset of Win32 that was available through Win32s, a 32-bit flat memory runtime for Windows 3.x that Microsoft made available to encourage transition. Microsoft's demo for that technology is actually rather famous -- Freecell. It's rather a shame they couldn't come up with anything similarly compelling for Win64... On the upside this means you can still play Enemy Nations on 64-bit Vista (in theory at least) unlike 16-bit games.
And well, OK, you don't buy my design advice about handles. I'm certainly not going to write a whole web browser to try to prove you wrong. I will say that I think if you look at how memory usage grows you'll see that there's a difference between the trend for small things to get bigger, versus for there to be more small things. This hard disk is more than a thousand times bigger than the first one I owned, yet the number of /files/ on my current disk is only 400 000. Did I really only keep 400 files on my first hard disk? No, I don't think so. I expect the web browsers in five years time to have only 2-3 times more 'objects' but the total RAM used will increase more like ten fold as the objects get richer.