The effort in finding a group has nothing to do with the inefficiencies of /lfg and everything to do with filling a proper group. I don't see how a chat parser would really change the effort you need to put in to find a group, you still ultimately need to be reading it and contact them to join.

I wish you would stop strawmanning LFD. Most of the problems you outline have more to do with instant teleports to dungeons, instant teleports out, and ease of finding replacements, and nothing to do with having a list of lfm/lfg parsed from chat. Even if that addon were kept in exactly as is (which would suck), you couldn't behave the same way as your retail example otherwise your group would fall apart and you'd be in the exact same situation.