Hi,
Here's my wish for the next release of Revit: To be able to view level and grid lines in 3D view
Thanks in part to working extensively with Google Sketchup, I now do most of my modelling in the 3D view. I've always been bothered that you can't turn on the grid lines and the levels in that view so that you can know where exactly in the building you are.
The weird thing is that Autodesk has already incorporated this interface into Vasari, and it is a great start. The Revit group should get some pointers from the Vasari developers, who nailed the 3D interface.