I've been using vim as my primary editor for a few years now and I love how there's always something new that just blows my mind, like the :earlier and :later in that pinned tweet.
Strangely 'A' and 'i' were the first two things I learned, and probably the only for a long time. It is interesting what seems obvious to one vi/vim user becomes a new trick to another, different needs etc I suppose.