The holy paladin talent tree has historically had issues with its filler talents. While many of the talents and abilities were spec-defining, there were other talents that literally had no purpose and were never taken. I'm talking about Sacred Cleansing, which actually didn't work at all throughout most of Wrath. How could we forget Purifying Power, whose usefulness was completely negated by the Glyph of Holy Wrath, which itself was only used to exploit a difficult encounter? Even with all of these junk talents in the tree, we also had a distinct lack of DPS talents, leaving holy paladins nearly helpless when left to fend for themselves.
Cataclysm's new truncated talent trees resolve many of the issues our previous talent tree had, as well as providing several DPS talents to give us some flexibility when we need to up our damage output. Exorcism has finally become the spammable attack we can use from range to nuke our targets, and Crusader Strike gives us some DPS presence while we're in melee range as well. The core focus of the holy paladin will always be healing, but it's nice to see that Blizzard created talents and glyphs to support both the healing paladin and the pseudo-shockadin that's emerging in Cataclysm.