You will have plenty of time - passport control moves really quickly & as most people travel hand luggage only (to avoid extra charges) your cases could well be waiting when you get through
The Magic Shuttle is a long walk & quite hard to find as it is not signposted well at all! We thought it would be like the Magic Express at Orlando but it wasn't. From the Easyjet terminal we found it easiest to follow signs for the train station then you will see more signs from there.
We only used the buses once as we found it such a faff - we now book a private transfer that picks up at the gate & drops off at the hotel!
Best advice I can give is to not compare DLP to WDW! There are obviously lots of similarities (like walking down main Street) but they are totally different types of holiday.
In the studios Crush & Ratatouille are must dos & depending on when you're going the Mickey & the Magician show is amazing!
In the main park Thunder Mountain is one of our favourites & is way better than the WDW & DL versions! Have a walk round the castle - upstairs there are stain glassed windows & downstairs there's a dragon!
Also have a look at some trip reports on here to get a feel for the parks & an idea of things you don't want to miss x