This is an example of what is possible with the Layout options for bar groups.
For the tree in combat, Raven is providing bar groups for debuffs on the player, spells (both buffs and debuffs) cast by the player on the target, cooldowns for healing-specific spells, plus short buffs on the player.
This is an example of bar groups that use Raven's filtering features to show bars for abilities useful to track in combat. The bar group on the left displays selected cooldowns for a holy priest, the middle bar group shows a proc buff used to time ot...
This shows an example icon configuration. It includes optional mini-bars which, like all bar/icon components, can be enabled/disabled in the Layout tab Format section.