All I can say is - I knew herbing would get more difficult when the raid opened and suddenly people needed pots. But holy cow. I've been all over Stormheim and I've picked up about 4 fjarnskaggl nodes. It's nasty out there. And this is WITH the sharding tech.
It's weird. I'm not seeing other players. I hardly ever seen one outside of the quest giver nodes. But I'll see herbs disappear before I can get to them, even though there's nobody there. And the respawn is abysmal.
About the only thing still easy to find is starlight roses, which ironically sell for the most... I think a lot of people avoid Suramar because it's "hard".