I think the only functionality anyone really wants back from it is the wireframe dungeon map. It's the only function that I've never seen in any other plugins.
Don't get me wrong, I love GoArrow. It's little ACMaps dungeon map just isn't what I and a most others were looking for. It only displayed a portion of the map, on screen, in wireframe. It showed a dot exactly where you were in the portion of the wireframe dungeon that was viewable. Wires got shaded darker if they were under you, and if selected, you could have it turn the wires a color (blue) if you'd already been in that part of the dungeon. You couldn't move it around or anything, but damn did that make dungeons easy.
Extravagent in it's simplicity of use, but I've no idea how it worked or how hard it is to remake