On IOS devices, you can swipe right on a playlist to simply add a song to queue, yet on Android devices we have to hold down on the song to open up the menu and click "Add to queue" which is much more of a hassle then being able to simply swipe on a song. This function should be added to Android too as it just takes too much time to simply add a song to a queue.
Thanks for bringing your ideas to the Spotify Community. However, a similar idea has already been suggested here. Make sure to add your votes and comments there and it may be considered regardless of its current status.