Man, same here, those early days of Cursor were mindblowing; but since then autocomplete has stagnated, and even the new Cursor version is veering agentic like everything else.
I hope if/when diffusion models get a little more traction down the line it'll put some new life into autocomplete(-adjacent) workflows. The virtually instantaneous responses of Inception's Mercury models [0] still feel a little like magic; all it's missing is the refinement and deep editor integration of Cursor.
On the subject of diffusion models, it's a shame there aren't any significant open-weight models out there, because it seems like such a perfect fit for local use.