I agree it's not going to be game changing and I'm not sure where I implied that it was. The proc on Grand Crusader is mainly meant to fill in empty GCDs and change up the rotation a bit.

Paladins do have a reliable interrupt in Hammer of Justice. There is a line tagged at the end of the Vindication talent that says "... In addition, your Hammer of Justice will interrupt creatures that are immune to stuns." So, if you can't stun it, you'll still be able to interrupt it (providing the spell can be interrupted). Also, the language on Avenger's Shield can be implied to say that it will also interrupt if it doesn't silence, but I haven't had a chance to actually test that particular part of it.

For Attack Power debuff, Hammer of the Righteous can spread that around to multiple mobs at once. However, you are right about only being able to do single target on the Attack Speed debuff.

As for tanking cooldowns, I'm not really concerned as much with the number as I am the uptime and quality of the cooldowns as compared to how the class functions in battle. If a class is already fairly tanky and their health goes down slowly, but steadily, then they really don't need cooldowns. If the class is a bit squishier and has to manage cooldowns in order to stay competitive then they need more cooldowns (or at least more uptime on them). Otherwise, it's just an epeen contest on who has more stuff.

There's a lot of survivability there, but I really expect them to muck with the details on these a lot. Because of that I'm waiting until a little bit closer to launch before talking too much about them.