Things haven't changed that much since I grew up. I still get very excited when I go into the stationery department of a large store, or, better still, a specialist stationery store such as Paperchase. The one thing that has changed is the amazing amount of choice available. I could spend hours and hours just browsing the lovely notebooks, paper, pens, bits and bobs... (let's not even start on post-its...)
Oh yes - one other thing has changed since I was a wee girl - the advent of technology. Being the gadget geek that I am, I rarely pick up a pen and I have absolutely no need for a paper notebook/planner of any sort, as all my notes, thoughts, todos, appointments, addresses, etc, are kept in various apps and synced between various computers/tablets/phone. Such a shame that I don't get to use any of the pretty paper notebooks that I buy when I get carried away in the stationery department!