Limitations of Quicktime files (.mov and h.264) in Windows 64-bit.

It was recently brought to my attention (yes, I'm late to the party) that any file that requires the Apple Quicktime process for playback (decoding) is severely limiting my otherwise powerful system. The Quicktime process is a 32-bit process, which limits your editing functionality to 4GB of RAM—even if you have 32GB or more installed!
I'm starting this new thread because the thread on which this was brought to my attention wasn't directly related to these issues.
A few of my questions: Why do so many cameras create .MOV or .MP4 files that require QuickTime components? 64-bit QuickTime X has aparently been available on the Mac for quite a while, yet I presume they won't allow anyone else to develop a 64-bit codec for Windows, so why hasn't someone sued Apple for monopoly, anti-trust, conflict-of-interest, etc? And most importantly, in a world where DSLRs and off-board ProRes recorders abound, are Windows users really stuck with no option but to transcode the footage before heavy use in Premiere? The Atomos recorders provide the option of using DNxHD, however, if I understand correctly, that codec still requires Quicktime (I've not tested this bit). Is there a matrix available that shows camera / recorded format / requires quicktime / 8- or 10-bit / 4:2:0 or 4:2:2, etc?
To my fellow Windows 64-bit editors, how do you keep your sanity when editing "natively" in Premiere .MOV, .MP4, ProRes or DNxHD with the 4GB RAM limitation? And what camera / off-board recorder do you prefer to avoid both a long transcoding session AND get right to work with native 64-bit codecs?
Thanks in advance!
=== Systems ===
Desktop              |   Laptop
i7-2600K             |   i7-3630qm
GTX460 (1GB)   |   GTX670mx (3GB)
         Windows 7 64-bit
         16GB RAM

strypesinpost wrote:
...Have you read this yet?
http://blogs.adobe.com/VideoRoad/2012/12/premiere-pro-and-quicktime-an d-nikon-oh-my.html
Just now. Yet, it seems to contradict my own findings. The article says: "In the case of Canon DSLR files, there’s something in the file header. Premiere Pro can recognize that the clips came from a Canon camera, and bypass QuickTime. This enables Premiere Pro to have smooth playback of DSLR files..."
The test I conducted was between files from a Canon 7D in their original format vs. an AVI file I transcoded from those originals using GoPro Studio (formerly Cineform). I load up a project and timeline with the original 7D files and then scrub the heck out of the timeline, back and forth. I have Task Manager open in order to monitor my RAM usage. I simply could not get past roughly 4GB. Once I deleted all the original .MOV files from the project, retaining only the transcoded .AVIs, the project cut like butter. The harder I scrubbed the timeline, the higher my RAM usage soared until it gradually, and gracefully came close to maxing out. Lol. Is there a better test I should run?
The other test I ran was a project where I took a single talking head clip of approximately 5 minutes in length. Nothing too taxing for the hard drive, and something that *should* be easy enough to play completely from RAM, once it played through once or twice. I cut this clip and staggered a few tracks on top of eachother. No effects, no transparency. The cumulative effect was a cuts-only edit, but on the timeline my tracks looked like stairs, etc (perhaps the stairs weren't necessary). The primary goal here was to watch how the system performed with a simple cuts-only project where Peremiere was repeatedly asked to access the same file from random locations in the file. The .AVI version of this project, again, played flawlessly. The .MOV version played even worse than I was expecting, since cuts-only 7D footage is usually not SO hard on the system (even if it is limited to 4GB RAM). The .MOV project couldn't keep up. Period. As soon as the file needed to "jump back" on itself, the refresh rate became intolerable.
So is the 7D an exception to the rule stated in that article? It definitely seems to be limited to 4GB of RAM! If it isn't, why am I seeing this?
Also, is it possible that the footage from the 7D may not *REQUIRE* Quicktime to decode, but since Quicktime is found on my system, the 7D files default to using it anyway?
I've not tested my GoPro footage so thoroughly, but I believe it's limited in the same way. After a transcode to AVI in GoPro Studio, even 2.7K footage plays slick as a whistle. Not so when I don't transcode.
Further thoughts?

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