Thank you for your kind words about our site.
Regarding the vertical grids. Well, I almost never use them. Yes, lots of designers use them but I think they are unnecessary. Some designers like to divide the page into 12 vertical columns and 12 horizontal columns which results in a complex 12×12 grid. And this is just fine.
But I don’t use such complex grids. I use 10, 11 or 12 column layouts and I divide page vertically into half, thirds and quarters. I set up guide lines in different colors so that I can see page divided horizontally. Using half page divider, thirds and quarters gives you opportunity to balance elements on a page. For example image can spread across 2/3 of a page and text on remaining 1/3 of a page…
There is an area that I haven’t covered yet and it is about baseline grids and grids in general. This is one of the posts I will have to publish in future, probably the most important and most useful one..