I've been using Trello for various aspects of my life for some time. Anything that has a flow, concept of "on deck", or a repeated list of items tends to make a good home for it.

Example: My learning (labels represent sources of learning, I have an on deck list and I stick to whatever I'm on currently -- or at least try to). I pick the most relevant thing to do next.

Another example: Vacation packing. I have lists of "Master List", "To Pack", "Staged", and "Packed". Whenever I take a trip, I move the applicable items from the master list to the "to pack" list. Haven't forgotten something on a trip in a long time. Bonus: organize labels by type of thing, and now I know exactly what I'm putting in which bag.

Trello is also great for organizing goals. 5 goals per year / month / week / day, in a way that bubbles up, is very appealing to me, though I haven't tackled this one yet.

Also, any software project I do usually has a board. Lists: Formation / Future / Waiting&Hold / Backlog / In Progress / In Dev / In Test / Ready for Prod / In Prod. Labels for issues, features, questions, ideas, high priority, and low priority items.