Ableton Live digital audio workstation, is a good example in my opinion. As with many professional tools, there is a steep learning curve, but once you get the hang of it, it becomes very productive. There are many nested collapsible sections, so you can choose to have an all-at-once view or focus on fewer elements.

Here is a blog post talking about the different ui elements http://nenadmilosevic.co/ableton-live-redesign/