I think that you would find that most Wiccans are not animists; although I'm sure you could find some who describe their belief system that way. Animism encompasses the beliefs that there is no separation between the spiritual and physical (or material) world, and souls or spirits exist, not only in humans, but also in all other animals, plants, rocks, geographic features such as mountains or rivers, or other entities of the natural environment. But more than that, it is the feeling that everything that is is Divine.
Most Wiccans that I know are more panentheists in that they believe that there is a bit of the Divine throughout all of Creation, but that the Creation itself is not Divine.
I've been Wiccan for many years, but I have no issue with killing weeds and insect pests if necessary. I'll use non-toxic, non-chemical means if I can. But when it comes down to things such as roaches, ants, etc in my home then I also have to consider my own welfare and the health hazards such creatures bring with them.