I also enjoy an avocado plain. I think that perhaps the easiest way to eat it is to cut it in half, then taking one half in hand, cut it into slices without cutting through the rind. Take your knife and run it along the edge between the rind and the flesh of the avocado. The slices should easily slide out of the rind when turned upside down and pressed. You can also do this to make avocado cubes or eject a whole half. It does take some skill with the knifework though. Mmm, avocado.
My other tip? Use fresh ground pepper. Makes it soo much better