I enjoy helping others experience the first time wonder of discovery, even after years of playing. It’s why I play in a custom setting and regularly create new monsters, spells, subclasses, and magic items. So many people crave that moment of first contact, and I love to help them find it.
On the DM side of that, when there are new things for the players to find, I get to stretch the creative muscles that I thought I had lost for years. I get to challenge myself to create new, interesting, and balanced experience to offer up for my table.