Two things I like in published adventures:
Wandering Monster Totals, and Origin Points.
When I was reviewing A1 The Slave Pits of the Undercity I remarked on something it did that I like - it gives totals of the possible numbers of all monsters you can encounter as wandering monsters. You can only encounter X orcs, or Y ghouls, or unlimited green slime.
This makes it feel like the monsters aren't just appearing out of nowhere as a tax on time consumption or just as wandering damage. They are as subject to attrition as you are.
Wandering monsters - at least - were like this in SSI's The Eternal Dagger. You could literally wipe out all of the Dwarven patrols, for example, or whittle down the most dangerous monsters.
I make some use of this in my own game - some critters are unlimited (there are too many to be worth counting, or reproduce too quickly) and others limited.
I also like to know where the monsters are coming from. Not in a general sense, but specifically - 1d6 goblins from the barracks on level 2, room 15. Rats from the rat-filled rooms, level 1 rooms 3,4, and 5. Big John the Troll from room 22.
That also makes wandering monsters feel more organic, more natural, and more rooted in the area. They aren't just sweeping in from nowhere. If you don't stumble into them in a hallway or while looting a room or searching a forested hill for that dungeon entrance, you'll find them eventually exploring.
These aren't big things, really, but they change a vanilla wandering monster table into a way of directly interacting with the population of the area. I like when published work uses these.