It would have been great if you could gather all the same movies within a collection, for example, James Bond, where now all the films are spread out and are very difficult to find. Then the movies could be gathered in a collection "James Bond", just on the TV series where the season is collected in one.
Here are a few that I think should be in a collection.
Harry Potter collection
Marvel collection?? (All the Marvel movies in one)
James Bond collection
Star Wars collection
The Lord of the Ring collection