A-Z Address Pages?

I am sure a lot of us have used our Filofax organisers to keep the details of all of our friends and family contact details, addresses, phone numbers, may be even email addresses in recent years. 

I have been gradually moving all of this information on to my Apple Contacts app, which shares the details across all of my devices. 

For a few years I would religiously export the data as a comma separated values (CSV) file and then do a mail merge in to a Word file configured as a file template to create my own printed name and address pages to go in to the back of my A5 organiser. 

When it came to reviewing the data this year, I decided that I could save some ring space by not reprinting all of the pages based on the fact that in the last 12 months I couldn't recall looking at those pages at all.  

Instead I would continue to just use Apple Contacts to locate the information contained in the A-Z pages. With the pages removed, I retained the A-Z dividers and started to wonder what purpose I could put them to? 

My initial thought was to use them to divide up my notes and information pages which aren't as well organised as I would like.... and filing information in some form of order would speed up finding information in future. 

If you don't use the A-Z for your names and addresses, what do you use them for?