To be honest you can go very cheaply or very expensively.
If you're looking for as cheap as you can, have a look at may time on Teletext holidays at flight and stay at Avanti you could go for about £400 pp.
We went in a villa last year with TC, it was £2800 plus tickets.
This year were going and staying on site at Disney in Art of animation, flights and hotel with QS dining and tickets it's about £7200
Next year were taking the inlaws and it's £6800 for 4 adults and one 11 year old who turns 12 whilst were there, including massive 7 seater, lounge, and Disney tickets with Virgin.
Really there's no rule of thumb where cost is concerned. TC couldn't match the price virgin gave us.
We will be going next may and we managed to get tickets the day after the kids split up, for a week on teletext staying in Avanti resort for £374pp. We will have to pay extra for our luggage and of course tickets.
To be fair. I do think Disney tickets are well worth it.
Do jave a look at attraction tickets direct for your tickets, they're great. We just got a $75 gift card for booking our Disney tickets with them, plus we got cashback- somehow they were cheaper than Disney themselves!
If you can go at a time where you can go to Mickey's not so scary Halloween party- it's brilliant!