Get a scanner. I recommend Fujitsu scanners (I have an S1300 - good for 2-sides, up to a dozen sheets in folder, etc. and S1100 - good for small receipts, single sheets).
The scanner will help you get through your stack (if that’s what you want to do). For future, use the scanners, or use your iPhone/iPad to scan using one of the many apps that can scan stuff. Hard to do a lot of bulk scanning with an iPhone/Ipad, though.
We scan EVERYTHING. We keep only the paper copies that are really important and we might need the paper originals. We shred everything else.
We use a simple file naming convention YYYYMMDDHHMMSS Money xxxxx. where the date/time is obvious and default provided by the scanner, “Money” is a tag which says it has something about ‘money’ and xxxxx whatever we want to say to elaborate. We don’t use OSX tags. All the files get put into the same folder in dropbox called ~/Money. Everything. The date/time in the file “remembers” when it was created regardless of the system dates (which can change).
We use Finder to search for things by sorting, searching, or whatever. Finder’s showing an image of the document’s first page is terrific in finding stuff. Going back to find things doesn’t happen as much as you would think, but we have piece of mind that we have everything and everyone in the family with access to this Dropbox folder can get to stuff as needed.
We don’t use folders, but sometimes every few years we move stuff into subfolders by Year (to cut down on the size of the folder), but otherwise no complicated folder stuff. Not needed.