It's long overdue, but I've just added a plugin so you can "subscribe to follow-up comments" via email. Note a new checkbox just before the comment form. This only works if you leave a comment; lurkers will just have to watch and refresh. You can also "manage" your subscriptions, as in turn them off later if you get sick of them.
Also, we've been getting hit with a lot of (human) spam, so I've been having to turn comment moderation on and off. Thanks for your patience.