All but battle of Ilum so far. In the beginning it was tough. Especially as our tank hadn't done so many dailies and my regular group has two melee dps.
Also, none of us did pvp for easy gear, two of us did dailies for about a week and modded our gear.
Once you get a feel for how heals flow in different encounters it gets easier. Just as it gets easier once you start to get gear. There are times I wish my aoe was a bit more powerful and most the time I just throw a hot on each dps.
Refresh it from time to time when the tank is ok, with that many hots ticking you should have upper hand active enough to throw it on the dps if they suck an aoe or on the tank if they need it. Sometimes my best mileage comes from playing the <35% game. Where the buff isn't consumed and you can go on a healing spree.