I've fallen into the same groove. Things 3 is handling my tasks, and I time block on my calendar at the end of every week. Then I check in each day to see what was planned and to make sure that the week plan still reflects the reality of the work that's coming up.
The problem with tasks lists is that they give the same amount of space to a task like my upcoming time blocking course or taking the garbage out. One takes way more work than the other. Putting it on your calendar helps you see how long something will truly take in your life.