I not only remember the ticket books, I have at least complete sets from both Disneyland and The Magic Kingdom (WDW). Did you know that they were interchangeable? You could indeed take tickets from Disneyland (where I worked and lived nearby) to WDW. I did this on my first WDW visit in 1978. As a cast member at Disneyland I got in free at The Magic Kingdom, but I did need tickets for the attractions. So, I bought them at Disneyland at a discount and used them in WDW!
One thing I miss with the ticket books. It allowed seniors (my grandfather back then) to get in for just a nominal general admission price and enjoy the day with the grandkids as well as the many free shows, music and exhibits. I feel sorry for seniors now (my parents) who may want to go in to be with the rest of the family but it becomes a waste for them to pay for a full-fare pass (even at a senior discount). I think something should be done about this. I'm not sure what, but the current policy leaves the older folks out of the fun and enjoyment they could have. In some ways I really the ticket books!
Any comments about that???