Thanks, Rosemary! Once you pointed it out, it became obvious... There are so many features already in place that I'll probably still be discovering new ones 5-10 years from now -- not counting anything that is added during that period!
Lindy, now that I've seen it, there's another way to get the same list. From any surname page, there is a list of genealogists' tools just below the list of related surnames. One of the options there is "limit to watchlist"; another is the "include people with current last name" that Rosemary mentioned. Both of those options are toggles, so you can turn them on & off as wanted.