I am having this problem as well, and find it very cumbersome to search for text or phrases within my google drive with so many other unrelated documents/pdfs/note pages popping up in my searches.
The main complaints I’ve heard from those who I tried to convert to PaperPile are: (1) Word integration, and (2) Searchable text. Essentially, those are the two main features available on other ref managers that they really can’t go without.
I know that a plugin is in the works for MS Word integration, but a full text search integrated into paperpile would really go a long way to courting more users (at least in my experience).