You can't get overwhelmed with all the new features. You have to pick the things that matter to you to learn. Is it worth investing in SSxS? I have no idea. If it appeals to you, if it can help you in your job, or get another job than it probably is. However we all invest in things and it might not help us. That means we picked the wrong thing, not that we shouldn't have tried to improve ourselves.

Learning core skills, T-SQL, admin, backup, those solid fundamentals and getting better at them has never hurt me or anyone I know in their career. It's not as cool or sexy as some of the other features, but it's important. Learning something new will help you if in no other way than it creates the habit of learning.