In Spotify, add to queue adds to the end of the queue for me. But the queue is always ahead of whatever you were previously listening to. I prefer it to be this way, for me. The queue is the additional songs I want to listen to, ahead of the main thing ive selected, which I eventually want to return to.
When I want to listen to first this, then that, then that, etc., I "add to playlist" instead of add to queue.
Now, if I do have a queue already but I want to select a new song to jump to the front, I do have to go into the queue and move the song I want next to the next spot, so I'd appreciate a play next button also.
In apple music, does play next always become the next song, and pushes the other "play nexts" further back? And does add to queue add to the very end, or is the queue a special list in front of your main playback like in Spotify?