Every carrier claims they're doing it the best or only way and everything else wastes time. The REALITY is some things work better for some carriers, some other things for others. We are all not mentally the same so do what works for YOU. Don't be afraid to try different techniques, usually on a slow day. Sometimes you find using lists on busy days and not on fewer parcel days works too. Depends on your route, your vehicle, your parcels, and other requirements like forcing DPS to street.
I've worked in many offices, some with 50 routes, doing a different one each day. I'm now regular, but have found what works for ME. I tub chunks by section of the route. I use an excel spreadsheet with every address of the route in order top to bottom. As I load I list what doesn't fit into the tubs, then folding in half on visor. This serves two purposes. First, it helps me memorize what I have for the day. Second, when there are two, five, seven to one address, and I've got 300 in the LLV, I search until I get all of them and don't have to go back, which is lots more costly time wise than the little time it takes to list on load. I've tried marking parcels, doing nothing but with the volume I've discontinued both. Handling the larger ones once but listing them as I load is the fastest consistently for ME.
FYI -- I typically case everything, as flat and letter volume is strong in our offices. "Tacos" daily with EDDM, backers, etc. Every home gets mail every day, except those on vacation or temp vacant between owners or tenants -- and those no deliveries I mark with an old "vacation hold" card so I don't have to look at the mail during delivery. Yellow card means skip that box. Again, carriers, try stuff and do what's best for you. BEST may mean almost the fastest way BUT less mentally stressful. Best of luck.