Gatherer is good in that it will put every possible spawn point for a given herb or ore type.
You can filter out, so you're only finding herbs which you know mill into a specific inscription reagent.

But there might be 25 herbs up in the zone and 100 potential spawn points for the herbs you're searching for.

You can import their database, which is every herb anyone has found across all servers for an extended time period. With Cartographer it will add points to your main map (quite possibly to any map too, not sure on that). Ore works the same as herbs for the database.

You can have it make a heads up display type thing, and resize it. And color where you've been a red shade. Very customizable so you can run a pattern across any zone easily. I found the HUD got in the way, either blocking my vision or too transparent to be useful (but that is configurable too).

A lot of nice tools for it, but I've just moved to dailies for gold, and buy what I need on the AH; I can make "x" per hour gathering/farming etc, but get a ton more just doing dailies on assorted teams.