Beta healing for me was two things -- more interesting, and at the same time, more stressful. I'm so used to trying to keep EVERYONE up that I'm not used to prioritizing who I am healing because I know I can get the tank and the dps with time to spare.
The other stressful fact is that the tank and dps aren't used to the new model either (Wait, what? The healer isn't at fault when people die now?? Blasphemy!) and still want to blame the healer for everything. And I do mean everything. Relatively speaking, dps wisened up really fast, but tanks were the WORST primadonnas you have ever seen. I had tanks pull groups without cc, wipe us all, and then bail. I had tanks pull without cc, managed to make it after, and then bail because I had to drink after the pull. I've had tanks run into full groups without cc and break line of sight while being out of range by 15 yards, die horribly, and then cry about it before ditching the group. (Not all of the tanks were like this, but enough of them were that it is noteworthy.)
I liked it because healing is more interesting, but this is balanced out by it being more stressful. So which is it more of? Only Cata will tell! :-D