Taking a Look at Your Next Action List Is More About Being Aware Than Finding Something to Dofleeting
In gtd, you are supposed to look at your next action, not necessarily to find out work to do, but most of all to keep a mental model of what could be done. Then, trust your brain to find out whether you would rather do a thing in the list or keep doing what you are doing. Linked to
This is why the next action list should be kept as small as possible, for your brain not to fight against taking a look at it due to needed cognitive effort.