My first trip to Disney, we stayed offsite. The next 3 times were onsite. And actually, the last trip, we flew for the first time. I weighed the cost of parking, car rental, traffic, etc... Nothing beats the cost and convenience of letting Disney handle it all. Now, I'm not saying that it would be cost effective for a larger family. It was just 3 of us. I'm definitely hooked on flying and Disney's transportation.
It definitely is a bit cheaper, but when I had to factor in car rentals and all that, it did add up. Besides after my first onsite stay, I was hooked for life - I don't think I can do an offsite anymore unless I do a non-Disney trip, which I've done a couple of times.
I grew up going to Disney off-site, so that's part of the reason i like it so much. I like the option of going to Universal, going to Publix (best grocery store ever!), going to different restaurants that we don't have in Canada, those things and obviously DISNEY! are what make a Florida trip for me.
Looking at staying onsite this fall for FD at a value. Im stoked, i could stay offsite for cheaper but have always wanted to stay onsite with FD.
If you do your research & book well in advance, off-site is going to be cheaper, and you stay 10 minutes away if you want to.
Disney has the convienence factor, theres plenty to that for sure. It's a vacation, so i can definitely see the advantage of that.
Personally I don't understand the "i can't do off-site, with Disney it's on-site or id rather not go" argument.
It's Disney World, the most magical place on earth. Why would you not want to go, no matter where you stayed? If it's a choice between staying off-site or staying home, i know what i'd choose!!
Everybodys got their own opinion and preferences, and thats awesome, we are all there to have fun!