The HID drivers that come with your operating system work fine, but you’ll be missing out on any manufacturer-specific customization features (nonstandard buttons, remapping, DPI settings, lights, etc).

I also don’t tend to install software like that (including the GUIs for graphics drivers too—just install the driver through Device Manager) and I don’t care about the lost functionality. But if you want your fancy gaming mouse to have most of the special features it was advertised to have, the software is useful.