Being able to group your slides under sections in edit mode can be helpful. Section dividers with the presentations I make a god sent in PPT. My Town Hall presentations are on the larger side (120 to 180 slides if I'm lucky).
Also lot of the content is from other departments and so in the end it's a presentation within a presentation. If the order of the slides have to change for any reason (and odds are they will, 9 of q0) I'm stuck rearranging twenty slides from the middle of the deck to top one slide at a time, praying I'm not mixing them up or forgetting any.
Sections similar to the ones in powerpoint could help because they allow you to group a number of slides together to move them around where necessary, quickly. It's also easier to edit a presentation when you can focus on groups and divide them amongst people.