Lines are not long at all... but FastPass is there if you need it.
Check the weather and be prepared to bring a sweater/sweatshirt or two - we've been in a coooool snap. 40's at night... 60's daytime... though are headed for slightly warmer weather towards the weekend. You should see low/mid 70's.
In cooler weather, once you feel that mid-morning sun, there's a tendency to say - "oh, I'll just wear a t-shirt and shorts today. It's warm enough." Then towards the end of a full day at the parks, that warm sun dips below the horizon and you end up buying a 'souvenir' sweatshirt.