From short term planning (templates for my week which I copy every Sunday to start a fresh week - these templates are a 7 day todo list (in columns) with a link to my main calendar, project 'kanban' boards, and a linked "general todo" list for things that don't fit in the week and keep dragging on)
After being addicted to scheduling everything in a calendar (for about 5-6 years), and having to drag items I didn't complete to the next day every single day, working with templates (and linked lists / embedded sections) in Notion is really a game changer. I've tried many other to-do tools (like Wunderlist which I loved before it came Microsoft To-Do, which I still gave a chance but had too many bugs).
Notion is just a game changer plain and simple, I hope they never break it, this is the only tool I have come to love and trust to keep my entire life in.