All good points.
I generally use two stereo reverbs; a short one and a long one.
The amount does seem to vary in what we hear today. The Church's "Under the Milkyway" comes to mind as more than enough.
Some people do it to hide their vocals, whether they are bad or not.
You do need to tune the reverb for eq and time. Too much low end and it's muddy. If the phrasing and tempo of the tune are quick, long reverbs sound sloppy.
I use monitors when I mix, but I go back and listen to reverb in the mix with headphones. Usually I reduce the reverb even more because it sound too much in the phones.
Reverb gets eaten up a lot by the music. You may not realize how much reverb you have until you hit the stop button and hear it ring out.
Here's reverb on the guitar, but not on my voice.
Regards,
Ty Ford