For me it was Terraria, Satisfactory, Tetris Effect Master Mode, Minecraft with Mekanism mod & CSGO / CS2 (almost 2000 hours in CS alone).
Edit: There are so many answers that I might only reply if I have something interesting to say. I will read all of your answers though. 🙂
I had the same experience, but the other way around. I started losing interest in Satisfactory after I found out the map was static.
Honestly, the good thing about that is that everything is hand crafted. So exploring is really rewarding IMO. A good example is an area where you find tons of power slugs.
I can appreciate that. Maybe I’ll revisit my spaghetti base one day and try to finish.