Paper receipts are the bane of my existence. It might see small and inconsequential, but I actually spend a lot of time wrangling those little bits of paper.
Case in point: I fill my car with gas on a weekly basis. Every time I do so, I wave my advanced contactless credit card over the payment machine, and then have to ask the shop assistant to print me out a paper receipt. I then scan that receipt with my phone using my favorite receipt scanning application (shout out to Receipt Bank here). The automated back end of Receipt Bank digitizes my invoice, I check it and then export it into my accounting system of choice. It’s not a huge amount of effort but every invoice takes a few minutes and required another piece of paper that it shouldn’t.