I'm not saying in anyway that the last UI was good.. but everything about the new one is worse. Sure to do X its only one more click away, or to do that its only one more menu deep now... but adding it all up... JIRA is so annoying and slow to use.
I have attached an image which is a perfect example of this poor UI experience. I type the name of an epic, almost verbatim, can I just press enter? No, of course not.