It's largely because I DM d&d. During our game last week, the party bought a carriage and some horses. So I generated art of it on the fly. They then encountered a zombie orc. art on the fly. Then I use it inbetween sessions to generate NPC art. I've been using SD since it launched and they each have the pros and cons. But recently ive been using the midjourney /blend feature to combine diecut sticker like art with npc art to get really cool videogamesque stuff.

I probably spend 1-3hrs a day generating stuff, trying out different models, fine-tuning models, etc. Its especially great to do on the iPad in the evenings while I am watching my shows.