For starters, I assume your druid is a feral/tankish type druid? If so, you could setup a /castrandom macro that you could just button-mash with one key while you "played" your mage. This would be somewhat difficult as you would have a tough time adjusting for adds and such but it should simplify things greatly.

You would probably also benefit from looking through all the macros and addons threads over in that forum and see how people have condensed activities down to a few keys for their main functions.

That's where I'd start.