I've been tanking for 2 years (Druid then Pally) before trying out Holy on the pally, and I have to say it's been extremely rewarding so far. I really don't mind the way bacon is working right now, and the shield buff is very cool. I have to agree with the above poster that talked about satisfaction vs. difficulty level. Yeah we're difficult to play but damn is it fun!
Tanking on the pally pre-3.0 was the same thing... it was the infernal machine, 12 different buttons to worry about on independent timers, a GCD that was always in the way, a taunt that could wipe a raid if used at the wrong time and real gear grind/gem/enchant problem to get crush capped. But it was fun and therefore satisfying!
If anything I'm worried they'll nerf our bacon... I'd hate to see it change it's function, but I do second the "Longer lasting but more mana cost" sentiment. It would be great if bacon was a cast-and-forget type buff that lasted a whole fight... but that would make it too easy I guess.