As the title says, which abilities, traits, ect, really changed the way you play your class?
For me there were two; first was swiftcast from tha. My SCH, I felt, was always at a good level in terms of skill and doing my job in a timely manner. I actually didn't get swiftcast til well after
I hit 50, man, all those levels of swiftcasting I missed! Swiftcast for me is a god send.
My second is Cover for PLD. I did not start using this til expert dungeons and it made a world of difference. It gave me some breathing room when trying to keep hate on a group of mobs. However, nothing is more gratifying then covering a whm while they spam Holy and watching mobs melt under a downpour of holy awesomeness.