There are plenty budget type hotels around the disney area, I checked out plenty when I was on the internet for hours getting the best deals! Most of them do free shuttles to the parks. You can get an them from £20+ a night. You dont have to spend shed loads of money if you dont want to.
As I already said I am an adult and bloody loved all the parks!
£120 for 3 of us to go to Legoland for a day? £84 a day to go to any D/U parks as many times as we wanted to (went to more than one in a day sometimes) with the ticket deal I got.
'Blues brothers' singing outside the irish pub we were in for lunch (dont have the corned beef and cabbage! wtf was that?? but the fish and chips were lovely)
Watching the 'de lorien' being driven past me, all the HP stuff, we rode the Hogwarts Express for gawds sake, film memorabelia from all my fav (and old!) films.
Did you know we met a raptor? (I might have mentioned it) A fecking velociraptor!!!! I was in heaven
There is so much for adults too, the marine life, the space/future world stuff, the tree of life is fab. A lot of it is educational and great for both kids and adults.
Yes there is mountains of stuff for sale but we got some good stuff, kids weren't greedy, they had spending money from relatives and me and spent it how they liked. If it was tat they didnt get it, end of. I treated myself too! Plus there were shops nearby the hotel which sold disney merchandise including clothes (as well as non branded stuff) for a fraction of the price 
If its not your 'thing' then thats fine. But if it is and you can afford to go then thats also fine and a fabulous holiday with memories to last a lifetime.