yes, it all depends on the level of accomodations you require to make your stay a happy one, how many sit down meals a day you eat, and how many days you plan to spend in the parks (which pass you buy)
Also, you can plan to spend more for the a trip with the same exact room/etc. if you're going during regular and not value season.
So it varies a lot. I'd think that for a family of four for a week long vacation in a deluxe hotel, that 6-7k is not out of the question for what you can spend.
Now, for my family for this slap-together-planned-in-no-time-flat with mega discounts, this is what our budget looks like without food involved:
This is figured for 3 adults 1 child age 8 (my dad has an AP so no park admission has to be paid for him)
Discounted room rate for CR wing standard view room, 6 nights (incl. 25 per night extra adult fee

1231.00
airfare for three (my ticket was free with a voucher) REALLy low rate : 408.00
Park passes: 2 adult 1 child 5 day hoppers ordered in advance online with Will Call pick up (no shipping fees) approx. 685.00
Ground trans towncar through mears, round trip for 4 to Magic Kingdom Resort (includes 10.00 extra 'gate fee' for a MK resort) 130.00
so our budget for a six night, seven day trip from MI to WDW in September (value Season) before any food is figured in is: $2454.00
of course my dad says he wants to kick in some for the hotel room so our actual mileage may vary LOL.
Now, to book the exact same room at the CR in regular or prime season...WAYYY more expensive. So to go in the summer you're gonna usually pay more (unless you can get a discount rate at the last minute like they gave out for august this year).
so bottom line? you could very well end up spending 8k if you WANT to but you don't necessarily have to.
Read these boards, look at Mousesavers.com and keep your eyes peeled for discount rates on airfare and rooms...and book the best deal you can get.
this is why i plan trips at the last minute, cause we can get a much cheaper price on a trip that at another time of the year would cost us a lot more.
hope that helps and doesn't confuse you more! LOL
keep those questions coming and have a great day!
geek