As for your question, they probably aren't very able to unappreciate being extirpated or extinctualized either, but the world got along without us for, oh, about 3 billion years of critterhood and planthood. So though pre-human times clearly had their ups and downs, at least what the other living things didn't know then was that they weren't being targeted by uncaring forces who knew better. Now they don't know why they're dying either, but it still hurts unnecessarily. That's my human assessment.
Being enjoyed and appreciated isn't a genetic requirement. We made that part up because we could. Not because life needed to.
And by the way, I've got about 30 wild turkeys strutting around my place, very much in heat, ready to make little tiny baby turkeys on a moments notice. And if they aren't enjoying sex, then why are they forgetting to eat the corn I have out for them?
I'm not actually for humans abandoning the planet, because it is sort of nice here, in a polluted sort of way. But if and when we do disappear, the surviving species, even if it's just cockroaches and ants, will all breathe a sigh of relief. Even if they don't know they are doing that.