Are VISA gift cards accepted at Disney World?

Indeed. I just used several of them on my latest trip

Yes

Yep

Yes basically it's like a gift card also it all depends on how much you have on that card so yes it's very useful

It's considered money

I believe they are

Yes mine was

I'd double check with the parks, just to be safe. I've seen them declined and apparently others haven't.

The are accepted everywhere

Yes. If you really want to keep to a budget buy some Disney gift cards ahead of time and use those. Unless the Visa gift cards you have are the Disney ones.