Hi Zuzu....
Yes, my garden is much smaller than yours ... I have about 100 roses ... and our climates are different.
We each have our own gardening style and challenges. In general, I, too, avoid insecticides, but might use them for a few favorite roses.
I don't prune all of my roses every year. I do my "clean pruning" when I am disbudding. That's when I get rid of the winter die back and such. I just hated seeing the curculio damage so much, that I had to find a way to handle it and this works in this garden.
Smiles,
Lyn