The index is really only for things you want to find again later, like important meeting notes. For your every day task lists you can leave those out of the index.

If the process of indexing doesn't appeal, however, you might prefer the Strikethru system I mentioned in my other comment.

Most things I note just go into the notes for that day, and only the month is in the index. Bigger things (meeting notes, or drawings from a brainstorm session, or some project you are planning) get pages of their own and thus a place in the index.

But I've drifted from the original system somewhat.