When "Preferences / Watchlist / Add pages I create to my watchlist" is set, any redirect created is added to the watchlist.
I advocate more granularity in this area of preferences (i.e. covering the four options when I Edit, Move, Create, or Review, add to watchlist) such that redirect pages can be excluded. I don't find it useful to watch them, but do like watching other pages I've created.
Full granularity in this area would be options that allow the user to specify for which namespaces they wish to see articles automatically added to the watchlist, together with options for all namespaces, and to exclude redirects.