Someone could probably write a 3D graphics library that was simple to use and did just what you want it to do. But in all likelihood you're the only person who would use it, since other people have different requirements than just "draw spheres". There's not much demand for single-purpose DWIM 3D modeling software.
The point I was trying to make is that 3D graphics is a pretty overwhelming topic to begin with. If I were looking for quantum mechanical modeling software, I might find a package with the best user interface ever, but I'd still have to learn some physics just to be able to use it.
If you just need to draw spheres why not use a ray tracing program such as Povray I think it will be easier for you than to start learning OpenGL, in fact Povray already has a simple sphere object that you can use, and I think you'll be able to do animations faster win Povray than to learn Opengl.
Also Povray supports mathematically defined objects as opposed to working with OpenGL triangles.