After starting a new character last Tuesday on a medium map, I think I'm done with the current content. Some thoughts:
-Spectre armor + inferno fork and/or magnet sphere = GG. Like
Metro said, you can literally kill any boss just by standing still and shooting it till it dies.
-I found the twins to be the hardest boss currently in the game. Plantera and the golem seem to deal a lot less damage, are easier to hit, and can be more easily defeated with terrain exploits if necessary.
-Once you're done gearing up with an adamantite or titanium set, the game pretty much devolves into pure mob grinding. Though I guess that was already the case in 1.1; 1.2 intensifies it with the new jungle and dungeon mobs and their fancy rare drops.
-Crimson biome is much easier to navigate compared to corruption. Less tunnel entrances and fewer vertical shafts.
-Although it doesn't say in the descriptions, some wings provide a greater flight boost. According to my tests, ghost wings > jetpack > angel/demon wings.
-Magic builds are now easily available early in the game thanks to the craftable gem staves and robes. Starting with 20 mana and making the mana crystals require half as much fallen stars to craft also helps quite a bit.
-Hardmode bosses are auto-summoned way too often, too early.
-Solar eclipse is annoying as fuck.
-Terra blade is a huge disappointment.
-The giant trees can't be corrupted. Their wood blocks just stop the spread of corruption across the surface.
-Not sure if bugged but using flask of gold doesn't seem to make a noticeable difference in the amount of coins mobs drop. And yes, I used melee attacks to kill the mobs.
-I wish teleporters were wireless and had no maximum range.