62 Welcome to the forum games!
---
Easiest way to kill the Enderdragon in 1.9 that I've found so far, at least in creative mode: Put a dispenser loaded with TNT high above the portal and connect it to a comparator clock with a repeater for a little extra delay. When the dragon goes down to perch on the portal, turn on the clock and literally bomb her from orbit. I've noticed that she usually flies toward the portal from the same direction, so if you know what to look for, you can get the TNT going a second or two before she lands, which is helpful because the dragon doesn't stay on the portal long, and the TNT takes four seconds to go off. If you time it right, you can take out about a fifth of her health in one go. And there seems to be a limit to how high she'll fly (again, at least if you're in creative), so if you build your TNT dispenser high enough, it won't get smashed. Just make sure to leave the column of blocks directly over the center of the portal structure completely empty- when the dragon perches, she goes to the highest block in that column.
It also helps if you build an obsidian platform at the top of the portal structure to catch the TNT and hold it closer to where the dragon will be. Any TNT that falls down into the portal basin don't do nearly as much damage.
Also, cheesy way to deal with the crystals in Creative: Place TNT next to them. The fire will ignite the TNT, which will then blow up the crystal. It even works on the caged crystals- if you put the TNT on top of the center of the cage, its blast is large enough to knock out the crystal, even with the iron bars in the way.
I'd actually recommend taking a few TNT and enderpearls to the End when you fight the dragon in 1.9 precisely to deal with the caged crystals. Enderpearl up there, place a TNT on top of the cage, pearl back down. The uncaged crystals are still probably better dealt with with snowballs or arrows fired from the ground.