You could have found a lot of info about GS in the docs section (wiki) of this website. This is a good starter to get an idea of how the cms works. You seem to have some ideas how things work in a cms based on a previous experience with another cms. This is what slows you down, not the cms.
"Simple" can also mean that it's very basic and clean, without too much bells and whistles (although you can add them via plugins), which is I think the direction GS is going for, but not what you expect in this case.
"Simple" can also mean that it's very basic and clean, without too much bells and whistles (although you can add them via plugins), which is I think the direction GS is going for, but not what you expect in this case.