When entering a reference, controlled fields such as author, periodical title and keyword automatically match and display in situ rather than via a combo box. Data entry is overall pretty efficient - if lacking frills. There is however a clipboard viewer - which can be extremely handy if moving data from one application to another. EndNote has extremely flexible global editing - an easy to use way of updating all the records in a library. There are facilities to add data to a field before or after existing data, add new data to an empty field as well as change existing data from one thing to another.
Lists are easy to maintain and can be used with any field.
These standard linkable fields can be linked to fields other than the normal fields if required. Working efficiently with a sub-sets of records is essential. You can search for empty fields. This improves the searching tremendously over version 3. Another crucial improvement is to be able to browse the lists to select a term for searching.