on /manage/notifs there's also getting emailed your own comment notifs (which technically is a Comments feature and not really ESN, but it's on the same page with all the others) which is Paid,
someone votes in a poll I posted - this is a Paid notification, although Plus users can post polls (technically, so can Basic maintainers of Paid communities, but). Not sure if that's an oversight or an incentive to buy a Paid account.
defriending notifs (oddly non-parallel with friending notifs, but whatevs), Paid-only.