For is master graduation thesis in Industrial Engineering Oscar researched why 80%+ of Workflow Management implementations failed or failed to increase productivity. Although few mastered it, those that did achieved phenomenal gains in productivity.
Grasped by this concept Oscar has worked overtime to increase his own productivity, plus those of his team. Always to bring back the workload to healthy, challenging levels and increase time available for more strategic work.
Most productivity gains are both simple and assumed to be impossible. If this seems weird, please read the page-turner The Goal by Eliyahu Goldratt.
LEAN is also a great concept, plus Six Sigma for the improvements that are more difficult to spot. These concepts work best when there is a certain predictability of work. When work becomes ambiguous, a switch to Agile is worth considering.