Nope, bubbles no longer hinder rage generation. Feel free to bubble as much as needed. For Discipline priests bubbling is our bread and butter. In fact, when our bubbles collapse they grant rage, mana, runic power, or energy.

I believe Shaibachan is referring to the Paladin self-bubble that gives immunity for 10 seconds or whatever. Unless I missed a major change, that is indeed an aggro wipe that will usually result in a very quick group wipe. Tanks should never be using this ability.
As far the the shield-bubbles that come as a result as a heal, Jinjinn is correct: They no longer hinder rage/mana generation.

TL:DR
Pali self-bubble -> bad
Healer bubble -> good

Waryor's right about paladin bubbles as a general "oh crap" button (as in, "don't use it"), though to be fair Divine Shield does still have situational utility if you're careful about regaining aggro. It's great for dispelling most debuffs (especially King Ymiron's cower while he's running to the boats) and some fear effects. Divine Protection, aka pally shield wall, is what they should be using as a "bubble."

Yeah, the Pally bubble's are what I was referring to.

Those are bad JuJu. And while I understand the dispelling debuffs (use it all the time when not tanking) I'm not sure how usefull it would be as a tank. I guess if everyone else is out being feared it might work, as you'll have time to regain some aggro, but not sure it would work that well.