My top 3 off the top of my head.
1)
Disneyland is in Florida
2) MK = WDW and WDW = MK
3) You can walk anywhere
Now as to the "expensive" discussion...
A trip to the mall can be expensive! Thousands if you want too.
Plus we should remember "expensive" is definitely a relative term.
NOW I THINK TWO THINGS...
1) WDW does not cost (or have to cost) as much as most people think.
In the $2,670 example above... as was stated, the airfare can't be chalked up to Disney so $1326 for 4 days for 3 people doesn't sound all that bad when you figure it includes all of your meals, entertainment and lodging. Factor out the cost of lodging anywhere else (usually more than WDW) and the cost of eating anywhere else (probably less than WDW) but factor out both of those costs (which you would have on any vacation) and the WDW/entertainment portion comes down quite a bit. Plus you can skim if you need to... skip hopping, dining plan, buying tix from broker, discounts on hotel, etc...
But its still $1000 for 4 days of entertainment for 3 people ($80pp/day) Not hard to get $80 worth of entertainment in one day. (figure the cost of a movie or ride or show then figure you are going to do a lot of them in one day) Doing it for 4 straight days is where it adds up. But it all come back one's own definition of "expensive"
AND 2) WDW does not have to cost more than other vacations
We rented a house close to a beach a couple of years ago. The lodging was more, but there were not a lot of expenses once we were there, we did go carts one night and putt putt another. So minus the travel(gas), food and shopping which you pay for at WDW or anywhere else I'm assuming the trip cost us around $1400-$1500 for the 7 nights (entertainment, cleaning fees, taxes etc..). . (we did a less expensive house and late summer rates, the houses went up to $4k/week)
Two trips on an AP to WDW. APs (for 4) $1738, hotel year one (at 7 nights) $498, Year 2 (again at 7 nights) $516. For a total of $2873 or a price each trip of $1436.50.