The Spotify queue is very bad.
Let's say you're in the middle of listening to an album or a playlist, and you want to queue up a couple other songs to play that's over. Cool. So you hit "add to Queue" on those songs. Guess what? They're going to play NEXT. They're in a section called "Next in Queue". The album you were listening to? It's in a section AFTER Next in Queue, which is called "Next Up" -- the name of which is a lie because the "Next in Queue" stuff is going to play next. The only way to get those songs to play later on as you originally set out to do is to manually reorder things. The basic principle of a queue is that things get lined up one after another, but in Spotify anything you add to the queue effectively jumps in line ahead of everything else.
Apple Music has a simple pair of options for each thing you add to the queue, which are "play next" and "play later". They do precisely what they say. No idiotic subsections that don't make sense, just a list of what's playing next to which you can add tracks to the beginning or the end of the line.
I generally like Spotify and am happy with it, except this one thing, which is stupid and bad and whoever designed it should be drowned in a river.