Alright, so I tried out Mountains, Forests and Rivers on the second part of RobA's tutorial.

The first time trying mountains was a disaster.

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The forests didn't come out super great, either. When I Auto>Normalized the colors, it turned the lighter greens into a gaudy neon color. Applying the bumpmap did nothing to change that. I played with the color settings and opacity to try to tone down the neon. Another problem is that the forest loses definition and texture toward the center of the large areas. I used the same noise (via copying the layer) as the grass bumpmap with a higher depth, so not sure what I did wrong...

Anyway, I deleted all the mountains, went back and tried again. I followed the basic tutorial as much as possible, but even by duplicating the mountain bumpmap layer, I couldn't get the same "pop" that RobA (and others) seem to get, nor the same variability in peak height.

Here's the second try:
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Then, I decided to try out RobA's other Mountain Tutorial in the context of this map:
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Then, for kicks and giggles, I combined the two. I allowed one of the two identical bumpmaps to overlay on top of the second mountain style:
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Then I tried it with both duplicate bumpmaps on the second style:
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Overall, I think I like the two combined, with only one extra bumpmap overlay, the most.

Didn't try redoing the forest yet, but started to try to carve out rivers. Issues: the forests completely cover the rivers in many places. I'll have to pick the brains of those who have figured out how to carve the rivers through the forests (and maybe later those who carve rivers through mountain canyons), and play with the rivers more to make them pop as well.

Also: I corrected the coastal waters issue that I had previously. RobA was right, I hadn't applied the second displacement map.