I have owned my D800 for 2 months now and have to say i'm delighted with it. Yes it spanks you when your technique is off, but when you nail it the results are amazing.
As i have learned from this forum, a higher shutter speed is advisable especially when shooting freehand.
I shot a wedding recently (which was risky for two reasons, 1. i'm not a wedding photographer and i was new to the D800) but the results were great. when i showed the bride the next day some sample shots on my iPAD she was blown away ... as a side topic, the ipad is really the perfect way to show and play with 36Mp shots. The screen resolution does justice to the shots and you can move the shot around, zoom in and plan what crops would be best.
Another advance i made with this camera was (after watching the joe brady videos on Youtube) buying a Sekonic L-758, it tells me the optimal "incident light" settings and now my manual exposures are just bang on ... so really now, i only have to focus on acheiving good focus and good composition.
as a last point, i have to say, i like the fact that the D800 is not easy, it keeps photography challenging and the excellent results you can achieve stand out when compared to lessor SLRs or point and shoot cams/phones.