It's common knowledge that productivity means getting shit done, not fine-tuning your task management tools. Improving the usage experience from time to time may be necessary, though.
I've got a bunch of customised perspectives that show me certain aspects of my workload. The most important ones sit in the tool bar and I'm happy to have happened upon a collection of icon sets that give the OmniFocus tool bar a consistent design. You can find them over at SimplicityBliss.