I use yahoo.jp for a couple things, to check weather, since it seems to be the most reliable results and to check for train schedules, which is pretty awesome when you don't have a car and you use trains a lot.
My wife checks the site sometime for celebrity news, but that's about it.
When I was younger (like 10-14 years ago) I used yahoo for chatting and messenger, and never really as a search engine, so I see what they're saying.