Not a wonderfully usefull menu for a digital painter.
The Show Rulers is somtimes usefull. If you need to place somthing centrally then set the Rulers to percent (right click and contextual menu in visible Rulers) and use this as a guide, perhaps with some guides that you have dragged in from the side. I find the ability to centrally place things usefull for when I am painting portraits.
One very very anoying PS default is the Snap command. This contrains all moves, brushmarks, tools etc so that they snap to the edges of objects, guides etc. This somtimes makes working very difficult and for some reason is on by defualt. It is almost always better for a painter to work with it set to off.