Put me in the camp of 'WB saves time and gives instananeous info for tuning the transitions'.

For those of you that tune by going to the track or dyno, how would you do it if you didn't have a track or dyno nearby???

And I don't think this has been mentioned yet:
You can have a combo that runs really smooth, so there are no immediate clues to a 'bad' fuel curve. A WB can give you immediate insight into whether there is more potential that should be investigated.