I’m probably guilty of seeing something like Agenda, really liking how it looks, thinking I should use it, but ending up being too busy doing stuff, and not as good as I should be about organising things.
I mentioned the way Fantastical lists events on the left hand side, and you can scroll through them, and use a calendar view to quickly scroll to the selected date. Which is how I would love the right hand side of Agenda to work.
Again, everyone is different, but I quite like a list view in a calendar to scan through and see what is coming up. And I guess to me within that list I can have actual events, or due dates / reminders of tasks.
On a side note, but a real bugbear of mine is the way a lot of the iOS calendar apps list all days in their list view. Which I hate, because I’d rather just see the dates something is happening or due, and not have space taken up by days with nothing.