If the buttons are overwhelming for anyone, don't be afraid to slap them up there and click on the ones that look interesting occasionally. You will figure out where their utility is! Especially as a healer where you have to be a little more reactive. Don't feel bad about not having everything perfect right away. Keybinding for mmos is a skill that doesn't happen fast.
LB and rescue I put on my vertical side bar with the teleport and stuff I don't use as often. Your "oh kupo" button should always be accessible but not where you can accidentally use it!