Not only am I clicker...I'm a mouser in general. I use my mouse for as much as I can pretty much all the time, as such not only was I a WatchDog freak with all my clickcasting on both hostile and friendly targets, I'm also a mouse gesture user. I currently use AltaGlyphs (http://curse-gaming.com/en/wow/addons-3227-1-altaglyphs.html), which isn't really easy to use and doesn't seem terribly complete.
For those that don't understand the whole mousegesturing thing, let me explain further!
With my druid for instance, when I hold my middle mouse button and gesture right (basically drawing a horizontal line from left to right) I turn into a cat. If I draw a line from right to left I turn into a bear. If I draw a line top to bottom I either: 1) mount 2) travel form or 3) aquatic form dependent on my circumstances.
As a hunter drawing a line left to right calls or ressurects my pet....right to left feeds it. Top to bottom will either mount me or use aspect of the cheetah.
Now I know not everyone knows about mouse gestures...and even if they know about them I know a lot of people wouldn't use them...but!
Man, the Clique interface be a wonderful thing for assigning them.