(Apologies if this has been asked elsewhere; I searched but couldn't find anything related to it.)
When reviewing close votes, I often see a situation where I think a question should be left open, but (up to four) others think it should be closed. Per the mechanics already established, in these situations I'll click 'Leave Open'. But what I also notice is that in situations where I decide to close a question, I don't see how many people have voted to leave it open.
There is much discussion on meta about the dog-piling issue; if people see a question has a close vote, they tend to pile on without properly reviewing. I note this effect largely when I've decided to close a question and note that the reason I'm closing it is different from the other four people. This always leads me to question, if only for a moment, whether I had the right reasoning. What I don't see is if there are a number of people who have voted to keep it open.
My proposal would be to, in the 'Close' modal, to display the number of votes to 'Leave Open' the question. I think that if any such votes exist it would cause lazy reviewers to think twice if a more meticulous reviewer found cause to leave the question open.
A potential downside is that this may encourage behavior whereby reviewers click on the close modal to determine if there are any leave-open votes, but I believe the audits already help counterbalance this.