As we all know the major disadvantage of using Premiere Pro is the lack of native support for 3D. The other major editors like Vegus Pro and Edius Pro do support 3D editing and so Premiere Pro is lagging behind in this technology. With CS5 I was using the Cineform Premium plugin which did make it possible to perform 3D edits. Unfortunatly Cineform does not work properly in CS6 and so Premiere support for 3D is non existant.
Tim Dashwood's plugin (http://www.dashwood3d.com/) works in AfterEffects (and FCP 7 and X). Mac only though, I think. It's one reason I still have FCP 7 on my machine.
Have you used Edius for 3D? I'm seriously thinking of putting Parallels on my Mac and trying it out. I'm less fond of Vegas though I used it for 2D years ago