In short: the ability to give forms names which are simply for my own reference. Additionally, this would be how the forms are sorted in the gravity forms administration, not by the form title.
More long winded explanation / example:
At the moment, forms are organized by their titles, which are targetted towards the visitor, not me. I could, for example, have two contact forms which are tailored to different audiences i.e. retail customers and wholesalers, that appear on different places in my site. The title for both could be Contact Form. How to distinguish between the two easily? If I had the ability to give them each a name for my own reference, I'd call them "Contact form (wholesalers)" and "Contact form (Retail customers)". Much nicer.
There are workarounds of course to the example above; having form names makes it easier to organize and find the form I'm looking for. To me this sounds like a really simple modification that can't take that much time to implement, yet would be very helpful to the likes of me who have too many forms floating around.