I've barely played my paladin for the last week because my warlock suddenly became fun to play again. It took me about 12 months to get from 60 to 62. In about a week I got to over halfway to 68.
I'm affliction right now and it has some elements similar to protection. Grinding is very efficient; DoT up a mob, fear, DoT the next one, fear, first mob is dead, use drain soul and dark pact for regen. In comparison a prot paladin is more like this: pull everything, kill individual mobs fairly slowly (like DoTs) but have a steady stream of mobs getting attacked to create a high overall damage output. Use SoW for regen and figurine of the colossus for health, resulting in no downtime. In instances I often find myself in a similar role of keeping clothies from getting squished. Fear, seduce, deathcoil, and howl of terror make for a lot of control.
The Alliance does seem to be different than the Horde. I hate to start factional bashing, but more often than not they are noobs and are terrible at listening to directions. Having no Barrens results in Barrens Chat everywhere.
Being back on a PvP server was a huge change for me. It's not a constant gank-fest, but you definitely have to stay alert. I've learned to always have a healthstone and to not use deathcoil on a mob unless it is life or death. When I was destruction I ran with a succubus almost always, an invisible seducer is a valuable thing to have; but I don't use her against mobs to prevent her getting killed first. She's turned around ganks several time, pinning my new enemy in place long enough for a soulfire to deliver a lot of pain.
My biggest adjustment so far has been not tanking. It's so slow! People are taking half their time marking, CCing, I can't believe people consider such a tedious process to be normal. I ran into one paladin tank, but he told me to not tell him how to play his class when I pointed out that it would be faster to AoE pull. He was afraid to lose aggro on extra mobs and got offended when I said that's what holy shield and consecration are for. It just seemed silly to make a paladin and then tank like a warrior.
That leads me to my next rant; what is it with people not wanting to be told how to play? I'd love to have a warlock explain a better spec or cast sequence. So why would someone get offended by advice? Many people are so busy making themselves feel better that they never get around to actually being better.