A few favorites that I used to use all the time
In task titles fields /due and quick entry for dates (EG today tomorrow monday) - just prevents having to grab the mouse, find due fields, clicking, finding a date in the calendar
In Smartdocs /h1 /h2 /h3 etc for quick structuring of documents without needing the mouse to format - the more the merrier but quickly creating headlines is my most used for speed note taking without leaving the keyboard