What's your method to rotating wheels? Just randomly or e.g. meticulously moving them around clockwise / ccw one step at a time? Or something else? And how often do you rotate them?
I've never really bothered about systematically rotating my wheels, but as you know, Slap puts things into your head...
Most people usually wear the front toe on the angle from minimal on the inside worn down to significantly smaller outside, so that is the one to look at, also being the most visible. That is followed by a more even wear all over on the back two, depending on how much you slide into or out of anything, usually the back toe with more wear to the outside, back heel more wear to the inside, then the front heel wears the least of all.
I have calipers so it is easy to see what size the wheels are and rotate accordingly, but regardless of whether you measure them or not, most of the time I am going to move the back toe to the front heel, then back heel to front toe positions, all still the same way facing outwards.
Some people will often rotate the wheels inside to outside as well on the same spots if they wear a little too much, but like anything, getting on to it before they wear a lot is the main thing.
I have some wheels that were never rotated from some people, front heel is still almost new at 54 mm, front toe down to 52 mm and badly coned, back two wheels both below 50 mm and fairly evenly matched, as the person did a lot of slide in / slide out type things and was heavy on the back foot, as well as never skating the board backwards, but when people rotate wheels or even skate the board more like a twin shape, there is a lot more even wear all round.