My favorite ride experiences from recent trips are my first time on Storybookland - I had no idea what the ride was, and at 20-some years old I was way past the target demographic, but I was totally impressed by it and amazed that it had been hiding from me in plain sight all those years. And the guides were really cute.
Then Small World, the Holiday Edition - went on it last year and loved it. My sister and I took dozens of pictures of the ride and each other and had a blast. It was a fun experience to share. Plus when we came out they had turned on all the evening lights - it was a magical surprise.