Didn't see Paperless in these comments yet. Great way to never again search for documents, bills, receipts, warranties, manuals, etc cetera ad nauseam.
I installed paperless a couple of months ago, and then needed a document from it this week, for the first time. Standing at my front door, with a contractor waiting, I retrieved a contract in about ten seconds.
I find it very useful due to its automatic assignment of various labels, categories and etc.
These assignments mean very little work for me to keep things tidy. Icrn use labels etc for filtering so it is extremely fast to find JUST the documents I want.
Paired with a small, fast duplex document scanner, it's incredibly convenient. Almost any kind of document I get in, just gets thrown into a scanner, and then into a box - no sorting.