Four Thousand Weeks is a productivity book without any productivity. Or rather, it's a book for people who want to be productive, leading them towards a more happy and equanimous existence: realizing that life is indeed short, and we'll never get everything done. Burkeman offers another way to look at productivity and time management — you must accept limitations, and should focus on what is actually deeply meaningful for you.
I enjoyed the read and it resonated with me. Far more philosophical, but similar direction as It Doesn't Have to Be Crazy at Work.