feel like its a pretty underrated aspect of mixing and in beats/vocals, but when done right can truly add another dimension to a great track. what are your favorite examples? here's a couple of mine:

around 1:56 in transitioning between the 1st and second beat. the left right back and forth of the vocal sample is crazy and almost schizophrenic like. it makes the jazzy horn and beat drop that comes in on the 2nd beat after the switch go even harder.

another beat switch example the 2nd half around 1:53 in this dominic fike track everytime the snare hits the echo goes crazy from left -> right and back and forth it feels like the whole sound is all around you. creates a really full crazy effect.

2:30-3:25