Everything you say above is accurate when working in ProRes. In working with standard formats, Premiere is actually faster.
I have both, use both, am certified in both. I personally prefer FCPX (It is Sony Vegas on a Mac, written by the same team that wrote Vegas, hired by Apple from Sony). Vegas is the least popular of editors, it just happens to be by far the fastest. Sucks it's not entirely on Apple. Catalyst2 will be released for Mac in a month, and that's very fast to edit basics with, but still not Premiere nor FCPX.
You're right, the Apple side of the video card isn't suited optimally for Premiere. It's not the hardware, it's the software. Running Bootcamp makes the shortcomings of the Apple OS insanely noticeable. Same hardware, different OS, absurdly faster processing.
Premiere truly isn't at all popular in LA/Hollywood. Adobe is sinking fortunes into getting it to become the new FCP Studio, but Avid still by far far far away rules the roost with FCP Studio being next on the list. Premiere is climbing that ladder in great part, to cash incentives and support from Adobe.
In short, we agree that FCPX is probably best if a learning curve isn't at issue. Premiere is free, FCPX *can* be faster in rare instances. Premiere has a much larger userbase, and if one understands Photoshop, Premiere and After Effects are quite easy due to complementary workflows.
Incidentally, I have a couple passes to the Premiere breakfast if anyone wants to attend at NAB.
Moving to Adobe Premiere Pro NAB Breakfast