My two cents: I own a D800e and D700, used to own a D7000 and a D90.
My main body now is my D800e, and my Tamron 24-70 VC about lives on it, although I use by 16-35 VR on it quite a bit as well. The 70-200 VR and Sigma 150 also get their fair share of time on it - as does my 85 1.8g and Sigma 50 1.4.
Moving to full frame, especially the D800 you will notice a few things, primarily that you find that shots you used to take at certain apertures no longer produce the DOF you expected. Of course at comparable focal lengths to DX you are closer to your subject and thus have a thinner DOF so this makes sense, but even armed with that knowledge I found myself re-thinking the apertures I use for certain shots. I used to have no problem shooting at F/1.4 on DX, but find it much trickier on FX.
In terms of image quality the D800(e) is a beast. The dynamic range at lower ISOs and the detail it can resolve are unsurpassed by any DSLR. You really want to see it beat another camera into submission, down sample your D800 image to the size of the other camera's. I often use this ability where I havn't cropped much and I am not printing large to reduce if not eliminate the appearance of noise and create the appearance of an even sharper image. There is of course the cropping ability which is amazing - but I try not to get lazy about composition thinking I can just crop 2/3rd of the image anyway and still have an image the size of a D700 one (which is still an amazing camera and amazing images).
The D800(e) also has a pretty awesome video mode - and I actually find myself using it now whereas I avoided it with my previous cameras.
Since my daughter was born I am using my cameras a lot these days just to snap grab shots of family. Here is a quickie of my sister holding my daughter:
D800e w/ SB910 (bounced) and Tamron 24-70 VC @70mm F/4 1/60 and 100 ISO: