I used to get nervous about crowds too. Then I spent 10 days at the World last June (i.e., busy season). With the right touring plans I rode almost every attraction at least once (many major ones 2 or 3 times) and never waited in line more than 15 minutes. Eating lunch a littler earlier (around 11:30) and having ADRs for dinner also cut down on the waiting for food. The only things the crowds really impacted were the need to line up extra early for all the nighttime events in order to get a good view. I'm sure no matter how bad the crowds are now, they're nowhere near as bad as they are in June, so plan accordingly, stop worrying, and have a great time!