I for one am glad that there are the classic characters still in a number of places. There are those of us who love Disney, grew up with the classics, and have grown children, but still want to enjoy the parades and such.
I don't like High School Musical, couldn't care less about Hannah Montana, and don't really know who Phineas & Ferb are. Never watched the Disney Channel - when my kid was young, it didn't exist! Remember that the idea was for everyone to be able to enjoy Disney, no matter how old or young.
If your kids don't know who the characters are, maybe you could explain them? That's what I did when my d didn't know someone. I just told her the story (assuming of course that I knew!).