I have gone to a lighter load already. My kids now do one assigned pencil drawing (art) assignment and a chore on Friday. Other than that, Friday is an unschooling style day. During the week, my kids do (in this order) one “spelling workout” lesson (4 pgs. long, including vocabulary, grammar and one paragraph of writing), 2 pages of “handwriting without tears” workbook, one worksheet of math in a binder I created for each child (from multiple sources), a half hour of reading non-fiction science book of choice, a half hour of reading non-fiction history book of choice, a half hour of reading fiction book of choice, a chore, and a half hour to two hours of interest-based learning (depending upon age).
This gives them more choices and they love it. Their spelling, vocabulary and writing skills are great. They are learning math every day. They get to learn the history and science that peaks their interest that day. I have a huge library of non-fiction books in all subjects and levels which I picked myself (and I am very picky) for them to read. I have a huge variety of fiction books for all levels and interests for them to choose from.
We are constantly adding to our library, which makes the kids excited to see the new books. Sometimes, with their own money (the older they are, the more they generally earn), they buy books they are interested in.
As for the “boring” and “gave too much work,” I negotiate with my kids and change things up about every couple months. Last time, I took away some spelling (they used to do 2 lessons a day) and added the reading non-fiction (because my son wanted science in, and less spelling.
I also spend about two hours a week helping my eldest and about the same, teaching kids how to read and having then read to me (for the younger ones).