Normally, we just stop whatever it is that we're doing while waiting, and proceed to whatever it was we are going to be doing once we were both ready, because most of the time, we were both ready, we just thought the other person was not ready, and so we were waiting for them to be ready.
That being said, there are exceptions (where one person really isn't ready and is distracted as opposed to waiting), but even in the case of those exceptions, asking the question will generally also kick people out of a distracted mode as well.
Interesting. My fiancee and I get stuck in similar loops, but to use your distinction, she seems to get distracted rather than finding something that can be easily stopped once I'm ready.
See also: Boring Advice Repository, Solved Problems Repository, Grad Student Advice Repository, Useful Concepts Repository, Bad Concepts Repository
I just got back from the July CFAR workshop, where I was a guest instructor. One useful piece of rationality I started paying more attention to as a result of the workshop is the idea of useful questions to ask in various situations, particularly because I had been introduced to a new one:
"What skill am I actually training?"
This is a question that can be asked whenever you're practicing something, but more generally it can also be asked whenever you're doing something you do frequently, and it can help you notice when you're practicing a skill you weren't intending to train. Some examples of when to use this question:
Many of the lessons of the sequences can also be packaged as useful questions, like "what do I believe and why do I believe it?" and "what would I expect to see if this were true?"
I'd like to invite people to post other examples of useful questions in the comments, hopefully together with an explanation of why they're useful and some examples of when to use them. As usual, one useful question per comment for voting purposes.