Why do these songs seem to have too much reverb, but not?

[Salem Beats]

As in they all use different reverb? Wouldn't that make everything sound super disconnected?

So would each sound have a unique reverb channel? And by subtle returns do you mean the sends are sent in loud but the, let's say aux track, has its gain turned down? Does that produce different results than turning a send down?

One thing you could do,
to create a "complex space",
is create multiple verb sends and route them in series.

Parallel routing is also an option.

You could also combine the 2 methods:
Create 4 verb sends,
route the first 2 in series,
the last 2 in series,
and blend both of these series in parallel.

There's actually quite a bit of stuff you can do with reverb
if you feel comfortable enough with messing around,
away from the "beaten path".

-Ki
Salem Beats

 

[bandcoach]

funnily enough the current "beaten path" is a path that diverged away from the previously beaten path - before digital you had to apply individual reverb sends at each phase of a mix as you had very few devices to use to create a complex environment with. As a result you had two choices

1) use only one reverb on everything or
2) add individual reverb to everything via
i) a tape duping session (2nd machine recording your reverb application in real time) or
ii) during initial recording

Runstein and Huber in Modern Recording techniques 2nd Edition discuss this at length. I would think that, at this point, the discussion is merely a footnote or even non-existent in the 7th and later editions