Big fan of todoist. I've been using it for less than a month, but have already switched to the yearly subscription. I use Obsidian for my notes, but for remembering to do something, I now use Todoist. Any passing thought that I want to deliberately go back to (or even patterns of thinking, like every 6 months, reflect on this concept) can be put into Todoist and I know that I'll see it again.

I contemplated trying to do all of this in Obsidian but the conventional advice seems that while you can, it isn't worth it. Todoist offering a simple mobile interface where I can quickly add a task is great. I wish reminders worked a little better (I'd been using alarms on my phone for reminders I want at a specific time, and Todoist reminders aren't nearly as attention grabbing).