Splitting up for stores is a good strategy overall, IMO. Last time they had a separate queue for show floor (stores/smaller panels) and Hall
D23. For sorcerers on Friday, they had us line up for the show floor in either A, B, or C areas, each one in front of a set of doors closest to one of the big three stores. I'm not sure if they did this for the general show floor line as well (splitting the line by area of interest), but when they started bringing the line up from the basement general folks were lined up right next to us...and then they released all the doors at once, and let everyone run for it, Lion King stampede style.
I've heard the process was better Sunday, and hopefully it's more organized and less chaotic than that this year. But in terms of lining up time, it depends on what you're trying to get. Lots of scalpers ran straight to the Mickey's of Glendale pin store (which had a separate line from the main WDI merch store). Getting into the Dream Store was easier, but if you want something that's say, LE 50, you'll want to be closer to the front of the line. I kid you not - some people created an "unofficial" line on Wednesday. Eventually they were sent off property and started forming the line on the street.
In 2017, when I didn't have sorcerer, I lined up overnight at 11 PM Thursday for the Friday show floor open at 9. At open, I went straight to the MOG store, quickly got what I wanted, then went immediately to the Dream Store and didn't have to wait long. I skipped the
Disney Store that year - it consistently had the worst line, and I wasn't interested in any of the offerings enough to wait in it. That said, they did have Storepass (sort of like Fastpass - wait to get a timed entry to the store), which I could've tried for and didn't.