In my standard usage of Zotero, information panel (the most right one) occupies 40%-50% of the screen width. And almost one third of it is occupied by the field names. From the latter only a few are actually long, while the rest can fit into at least twice less wide column. Those that are long, probably, depend on the interface language (I use Russian interface, so for me they are 'Abbreviated Journal Title' and 'Location in Archive').

The idea is that this long field names can be abbreviated (may be adding a tooltip with a full name when hovering mouse over it). I consider this important, because it may save about 10% of the screen width, which can be used effectively for field values or other panels.