A lot of the tools are grouped with other tools in the toolbox.
For example to get the Brush Tool, hold down on the pencil tool icon to reveal the hidden tools.
You can tell if there are hidden tools by the really small triangle in the lower right of most of the tool icons in the toolbox.
Where most of the tools are in cs6, since this is a screenshot from cs5:
Thanks very much! Stupid of me. I didn't regard these tools as so similar as to think of that, and they aren't grouped in other programs of the kind. I think it would be worthwhile to keep them separate.