In our experience, things need to be even more organised when hiking as a couple. The gear checklist needs to have two columns (a column each), so we make sure the tent, pegs, stove, fuel, pots and other shared gear don't get left out (includes first aid etc...). Likewise with food. Our system is that one person carries, say, lunch, snacks and drinks, and the other person carries breakfast and dinner. This means we each lose about the same amount of food weight each day. Guidelines for how much food per meal per day are on the checklist. Our food container is full of homemade dried meals, ready packaged and vacuum sealed with meal name, date, and how much water to add (or other cooking instructions). We have the same foods for breakfast, lunch, drinks and snacks each day to make shopping and packing simple. We vacuum pack our fresh food such as cheeses and salamis into single day servings. This keeps them fresher for longer. On even longer trips, we seal these perishable foods in beeswax.
Our gear is partly stored in a closet, and partly under our beds. There is simply not enough room in the closet for four sleeping bags, one double quilt, four packs, many stoves and fuel containers, several sets of pots, around 8 mats, and three tents! Not to mention all the clothing that two people may own. We seem to have too much gear due to the need to also accommodate solo trips, and bad weather trips, and winter trips...Can't wait for the young adults of the family to move out and free up a whole bedroom for gear storage and organisation!