Okay, since so many posters seem to feel that this summarizes paladin concerns in a nutshell, I will share our concerns.

The argument seems to be:

1) Our mana regen has to be extremely high.
2) Why? Because we have to spam Holy Light.
3) Why? Because if we don't, the tank will die.

That is the problem. Right there.

First off, no other class can get the HPS that a paladin can out of HL. They might not even be able to get the HPM when you consider the Illumination return on mana. Your druids may have great numbers on the meters. Are they going to keep a tank up with just Rejuv, Lifebloom and Nourish spam? Probably not. They are most likely topping off the tank in between HL blasts. We are completely balancing MT survival around HL spam.

But really the more important point is you're saying "The content will be too hard." The content (assuming you're talking about hard modes) is supposed to be hard. Tanks not dying makes the content too easy. Spamming HL to keep the tank alive with a very large if not infinite mana pool to back it up isn't fun, and it's not fun for the tank either because we then have to resort to enormous hits to ever have a chance of killing the tank, because we're certainly not going to run the healers out of mana. So then tanking becomes a game of cooldowns -- can you get Guardian Spirit up? Can you use Pain Suppression? Does the tank have IBF or Shield Wall ready for that next big hit?

But if we just nerf HL and mana regen, then what are Holy paladins supposed to do? Well, now they can Beacon someone and heal two players at once. Yes, I know you could always do that before, but you just got done telling me that you don't dare stop spamming HL on the tank or she'll die. Now you can heal the tank and someone else, or just heal two someone elses. Yes, I know that CoH and WG look really good on the meters. But topping off 5 people isn't nearly as useful as saving the life of one person. You can still target players and heal them. Players do it all the time. PvE healing does not rest entirely on smart, AE heals (though they might look really good on the meters).

We'd be in a much better place if the steps above read like this:

1) We have reasonable mana regen.
2) Why? Because then every problem doesn't look like a job for HL spam.
3) Why? Because we can keep the tank up with the tools we're given, unless we're in a hard mode, in which case we better be at the absolute top of our game, fully flasked, with the best gear available and a raid that has practiced, practiced, practiced.

Don't worry about the "not invited to raids" part. All the healers are getting invited to raids now even if the shamans are slightly underpowered and paladins can only do one job really well. We think with those two problems addressed, things will be in even better shape in 3.2, and if not we will continue to tweak the numbers until they are.

The best thing you can do is get on the PTR and try out the changes and see what it feels like. We'll put a lot more stock in that than we will guessing (even guessing with math) what the changes will bring. (Which is not to say feedback is irrelevant unless you're on the PTR -- but PTR feedback is really good.) Some druids predicted the world was ending with the Lifebloom nerf in 3.1. They are doing just fine.