The PastSource: Ghostcrawler, post 40
The BC and LK design of the Holy paladin was basically to use one or two spells and get a lot of use out of them. This is sort of like the mage dps design, where there aren't a lot of sources of damage, but there are a lot of other factors (cooldowns, procs etc.) that make how you use those spells more interesting. So rather than the paladin having 5 different heals, they pretty much used Flash of Light or Holy Light (depending a little on what gear stats and encounters looked like at the time) but with other spells to boost those heals, such as Beacon of Light and Divine Favor, and then all the paladin support abilities, like the Hands.
For some fights, Beacon is awesome because it does so much healing.
For others, Beacon is awesome because it helps generate more holy power to use LoD over the raid.
For some, I'm mostly a tank healer with some powerful raid cooldowns.
For others, I'm a raid healer with a powerful hot on the tank.
In some fights, our mastery blows. Others, it ends up being a bit more healing.
In some fights, I'm afraid to use Divine Plea. In others, there's a 'safe' phase to use it on cooldown.
In some fights, I'm twitching for Radiance to go off cooldown so I can use it again. In others, I save it for specific abilities.
Sure, Divine Light is still my go-to single target heal, but Holy Light sees some use if I'm trying to conserve mana. I never cast FoL, but that doesn't mean I'm doing it right.
There's only a couple of things that never change. Judging a lot, Beacon on someone, Holy Shock on cooldown. Everything else depends on the encounter.
Maybe it looks different in 10 mans, but this has been my experience so far in 25's. How do you feel about your paladin? Are your encounters dynamic?