I haven't heard anything good or bad about how well Eugene did for world juniors. I was there for the last day on Sunday and both the stands looked pretty full. I know Eugene needs to add a ton of seats if they expect to host the world championships. I read this little blurb on the following page:
The six-day meet attracted 51,532 fans, and saw two world junior records, seven championship meet records, 21 world-leading junior marks, and 84 national junior records.