But it only works on what you can currently see, right? Or does ace jump work differently than I recall.
isearch moving you along further in the buffer interactively as you type is far more useful than searching what you just see, and typing rando letters that appear. If it's on the wrong entry with the same word, I just hit C-s again - which is very fast to type repeatedly (rather than ace's find the right letter combo, and type it).