ugh.. I can't stand dodge and burn. >< I find 80% of the time it just makes the image look bad mainly because the burn tool doesn't give natural shadows. If you just paint shadows and highlights yourself, it'll look a lot more natural. ^^''
Used to use them like some crazy phycopath. Now that I've experimented with different coloring methods I found that Multiply and Color Dodge I have more control over, and all the other blending modes for that matter.
Dodge= for the occasional highlight (unless I'm making something glowing exposure is never above 40 (exposure is on 80 for glowing)