It's not too bad, except during Fall. Then it does either become a constant battle with the leaves, or (as in the past) we get lazy, give up, and clean it all out when it gets warm again. This year we're going to try to stay on top of it, but we'll see what happens.
One year we actually did cover the whole thing during fall and winter, but it was such an incredible hassle getting that cover on, which nasty water, leaves, and debris accumulated on over a period of months, and then when it finally came time to take the cover off again, there was so much weight on the thing that a lot of stuff ended up spilling into the pool while taking the cover off. So, we decided it was more trouble that it's worth.
If we ever get to the point where we can afford one of those fancy hard covers you can walk on, we might try that. But otherwise, we'll just semi-maintain the pool year-round.