Wandering monsters are another classic, yes, but they vary with the scenario. In a dungeon inhabbited by multiple rival faction, there'll be outright patrols and watchers on alert and the like - and that'd make sense. But, in an ancient tomb, there'll be traps, constructs, and undead, all notoriously site-bound, in a hexcrawl, you cover days and weeks of travel, while a city with that kind of random encounter frequency would soon have no living citizens, etc...
The pacing of possible adventures varies wildly, the pacing at which 5e supposedly balances doesn't.
(I mean, unless you embrace narrative/milestone recovery, then how long a rest may be is undefined. But I don't feel like that's on the table, or even in the room, or the same county...)