Also see this discussion on the forum, about how the queueing system is confusing to people that like to listen to full albums at a time. The issue is that "Play album" does not work as expected.
Allow me to copy-paste my conclusion about the current situation from that other topic:
Why is that an issue?
Well, suppose you want to play Album A and then Album B. A rather intuitive way to try and get that done is this:
That doesn't work. In reality, it will play the first song of Album A, then Album B in its entirety, and then the remainder of Album A. This is not at all what anyone would expect if you execute the above two actions.
Suggested fix: clicking "Play" on an album should: