How to use the building grid http://www.youtube.com/watch?v=8k-XoIPycm8&feature=related

So I watched the video on the building grid and had no idea it was so configurable.  First, take a look at this neat picture of the grid:

Now, after I increase the snap size and also the opacity, you can see it a bit more clearly, you can also see how much bigger  the mesh of the grid has become:

Finally in this image below, you can see that I am placing my pyramid using the grid snap feature, simply by dragging while keeping the mouse cursor within the field of the grid itself: