How I save on Disney trips:
Airmiles, I get our Disney tickets from them - always months in advance. Over the last couple of years, I have upgraded our free Disney tickets to Non-Expiring with Waterpark & More so we can just do a day at Disney if we want.
I watch for flight deals out of Calgary or Edmonton - I don't pay over $500 for flights to Orlando and if I see a flight for under $400, I book it immediately (Last November, I got our flights Calgary to Orlando return with all taxes in for $360).
For car rental, I won't pay more than $200 for the week so I watch constantly (I have gotten a weeklong rental for as low as $89 with all taxes in but $200 is my line in the sand,

).
Accomodation is usually offsite in timeshare so I pay $200 in exchange fees and we are able to buy some groceries to save on meals.
I set my budget for $500 per person for flights, $200 for weeklong car rental and if I can get it cheaper - more money for next trip.
I have US bank account and put money in it regularly so I have spending money ready no matter what the exchange rate does.
We typically arrive at the park at opening bringing some snacks and water with us, then we leave around lunch and eat at condo, swim, relax then head back to park late afternoon/early evening (taking water & snacks with us) so we don't spend a lot of money on food at Disney. I do buy treats for my son - he loves the Churros and Mickey Ice Cream Sandwiches and we do have the one meal per day at Disney. Saving on food is a big cost saver.