From what I understand, Gimp, PS, and PSE are specifically photo editors. They are designed for editing existing photos or pixel-based drawings. You are looking for something else if you want to generate new graphics.
You heard wrong tbh, Photoshop has moved giant strides since its early days to be perfect for drawing/painting in, it's adopted a lot of Painter's brush-emulation type stuff (starting at Photoshop 7), and it recently incorporated a lot of Illustrator's vertex/vexel line tools, and integrates what used to be Adobe Imageready for animations and pixel graphics.
Photoshop CS is a complete powerhouse and I know more digital illustrators who use it (with a wacom tablet) than painter or any other software.. Photoshop Elements is also pretty decent for illustration/painting etc.. I'm pretty sure if you polled the industry, more GC artists/illustrators would use Photoshop CS than any other app..
Depends what he wants from his "drawing application" - but PS CS is by far the best all-round performer, which it's price reflects. Elements does a lot of what CS does though from an illustration/painting point of view, but the lack of layer effects is a big disadvantage. :/
For "drawing" some people should check out:
Sketchbook Pro (universal binary version launches in a few days) or
Artrage..
elements, bridge, lightroom... what is what? I have no time to study and learn their marketing tricks. Most professionals use Lightroom, I try everything but always go back to IPhoto, which with time has become (for me) the most usable software o its kind.
Bridge is a file browser.. IFAIK it comes with most/all adobe stuff and helps send files between the various Adobe apps.
Elements is Photoshop minus most power features, like batch commands, complex editing stuff, animation, layer effects, adjustment layers..
Lightroom is closer to iPhoto, managing a library for you, and offering you easy ways to edit and manipulate stuff on a normal/basic/photographer level.
I'd hardly call them marketting tricks, they're very different products with totally different toolsets for different markets.
You'd probably want PS or PSe still if you wanted to do anything more complex than a crop or colour adjustment.. For example, if you want to edit out a person, or blemishes, or move something from one part of a photo to another.. Also, you can't really combine painting and photography in Lightroom or iPhoto, or do anything particularly artsy other than just mess with settings.. Photoshop means you can make collages, composites etc..