Clicking sucks, end of story.
If you cannot see the efficiency and usefulness of keybinding, you lack logic and intelligence.
More mouse movement, less precision, staring at your ability bar rendering you oblivious to the environment, slower activation of rotation abilities, are just some of the negatives of clicking.
Common sense, if you play a healer and click, what takes longer... clicking the person who you need to heal, moving your mouse across the screen to click the heal, and so on whenever you need to switch targets OR simply clicking the person and immediately pressing the keybind...?
The worst player in your raid is a clicker, the worst player in your warzone is a clicker.
Keybind you fools...