I'm not sure how you guys are managing this. GTX 970 and 5820K here, personally I find it struggles on planetary surfaces at times on the VR High setting. It's not juddery - Async timewarp sees to that (it's glorious) but it's clearly not running 75FPS at all times in busy planetary environments, at least not for me.
Well... OK, so it IS locked at 75Hz, thanks to ATW. Maybe I'm misunderstanding what we're talking about though. If by running smooth we do just mean it's never juddery, then yeah it's lovely and smooth. Far, FAR better than it could have been back on 0.8! But for me it's only always 75Hz; it's not always 75FPS. I hope that makes sense.