It's on par with macOS for us - what I meant to say was, while I personally choose to work on Macs, our Win devs don't post as frequently on KVR
In regards to stray folders you might come across, there's of course the issue that certain plug-in formats are installed in their respective locations. But their data hopefully is installed only once, in a single folder (Diva.data etc.) for all plug-in formats to share, typically linked to by shortcuts.
We measure failures of documentation by how much support they cost, and I think that the whole topic of installation paths is covered well enough in the user guides, after many iterations to optimize that kind of information.
The shift-drag thing was supposed to be remedied by MIDI CCs for "selected" and "fine selected", but that concept never took off. Gotta figure something out eventually, but everyone here also has a lot of other stuff to attend to currently.