I can't believe so many people have been so negative?!? We went last week and had a fantastic time. I just wish we could afford to plan another trip.
I guess my tips would be...
If you are staying in a Disney hotel take advantage of the Extra Magic Hours in the morning as the queues are minimal and you can alomost 'walk' straight onto the rides.
Pick up the leaflets as you go into the Parks for a Guide Map and also Weekly Plan for shows, meet n greets etc and plan your days around what you really want to do
We found as much to do in the Studios as in the Park so make enough time to do both. The Motor Stunts Show was enjoyed by all ages.
Most of the charcters appear in the Studios am and over lunch rather than in the Park. If staying at a Disney Hotel check which characters will be appearing from 7.30 onwards as often it's a smaller queue there.
Do a character meal - we did the Princess meal which although expensive was worth every penny (or pound!)
Use Fast Passes. But if you want to go on Coasts Crusher (sp?) then run into the Studios as soon as it opens and queue. By 10.15am the queue was 2 hrs long and stayed over 1.5 hours all day!
Take some snacks with you because everything costs a fortune in the Park
I'm sure I'll think of loads more but those come to mind at the mo

Have a great time