I took the family a few months ago, absolutely amazing visit.
I took loads of photos but refrained from putting them on the forum as i feared it would be a spoiler.
The biggest tip, what i think is obvious if you think about it is; prior to the walkthrough of the Star Wars exhibit you have to watch a 15 minute Marvel cartoon in the old planetarium. That means that if you are the first to leave the planetarium you will have up to 250 people cueing up behind you getting in your face etc whilst you are trying to take photos etc. If you leave at the end like we did, you can take your time knowing that there will be 15 minutes between you entering and the eager beavers from the following cartoon exiting.
We were able to meander through during the Summer Holidays without any hassles whatsoever. It was only when we slowly got to the last exhibit we were caught up by the first of the next lot.
Take your time an enjoy