Trees vanishing from the face of the Earth would be a small mass extinction if that.
Humans vanishing from the face of the Earth would lead to a few extinctions, but it is rather unfair to compare how many species depend on producers vs consumers. Food chains are almost always short, and therefore very few things depend on carnivores/omnivores.
I still think that an intelligent, self aware, inventing species is more valuable than one that isn't even sentient.