As someone who doesn't care about the "strategic" MMO gameplay, the balance changes mean nothing to me, I play Warzones every now and again but that's it. The Legacy updates and misc. things interest me the most.
UI customization is great, being able to make the UI smaller and move the hud elements is amazing. Although it doesn't add anything gameplay wise the family tree seems really cool. The biggest addition to 1.2 that I'm excited about is the expansion of the Legacy system, I can now make a Sith Pureblood Jedi Knight and Chiss Smuggler!
What are your thoughts on SWTOR 1.2?