I know I complain about this all the time, but in my post-job-hunt effort to get back on top of things, I’ve been trying to manage my review stack.
It is unclear to me what the reward for submitting a review on time is. If you submit a review on time, the AE knows that you are a reliable reviewer and will ask you to review more things in the future. So you’ve just increased your reviewing load. This certainly doesn’t help you get your own work done, since you end up spending more time reviewing papers. Furthermore, there’s something disheartening about submitting a review and then a few months later getting BCC-ed on the editorial decision. Of course, reviewing can be its own reward; I’ve learned a lot from some papers. It struck me today that there’s no real incentive to get the review in on time. Parv and Anant may be on to something here (alternate link).