Disney should really stop marketing Fantasia as a movie for kids anyway. My experience with the 70’s and 90’s theatrical reissues was that many kids get really bored with it when Mickey is not on screen, or get the screaming meemies even before Night on Bald Mountain. 😉
I have heard of some people who’d agree with you but it surprises me. When I was a child, not a VERY long time ago, me and my friends used to watch Fantasia. We all liked it, and I couldn’t even think of it as boring. Recently I was lucky enough to be in a live concert featuring Fantasia. A lot of the audience was, in fact, children - and I could hear most of them were really exited watching it, except one 3-years-old kid who was sitting behind me and yelling “home”… So I’d say Fantasia is good for childern once they turn 5 years old. But of course it’s a matter of opinion. I can’t say all children would like Fantasia as I can’t say all adults would like it.