I'd like to see a new class called slider area

it would be component with a slider a text box and a label. Its purpose would be to simplify the slider class, making less overriding necessary, and to make the slider class simpler when the user is just creating a simple slider only controller. I find that I’ve been making this class over and over so I’m thinking it should be part of juce.

Why haven’t you created your own Slider subclass and used that as a stock item in your personal library? That’s the beauty of object-oriented programming.