I use Grid in order to see my party or raid, and many of their attributes like whether a renew is on them, or they have a debuff. Utilities like grid help you see and select all raid members easily, as well as provide a variety of information.
Personally, I bind heals to my number keys. Clique allows you to hold buttons like ctrl, alt, and shift, then your mouse to click on a user in Grid and heal. It also works without grid.
Another popular mouse click to heal utility is healbot. It just depends on your style. Some like to click heal, some like to bind heals to keys. It's what ever works for you.
Edited, Dec 6th 2007 7:32am by dadanox