Skipping "Collect" (sort of...)
When a new input comes in, I occasionally will write directly into my planner on the appropriate Next Action list. For example: "Gas station--buy gas". In doing so, I am (in a sense) leapfrogging the Inbox--> Process phase, but not really. Instead, I process the item as I receive it and park it where it goes.
The practice started to eliminate double-writing; for example, if I find a new word ("petrichor"), I may write it directly on my Quotes and Vocabulary reference list, knowing there is no action associated with it.
Because there are risks with doing this, I am careful to ask myself the right questions first.
This practice CAN save time and keep inboxes empty more often, but it requires the discipline of pausing to properly Process when new information comes in.