If you're raising shadows and increasing exposure, it will help. If you don't feel that the 7D is limiting your ability in processing your files, then it might not be worth it.
That said, the newer cameras are nicer to use than the older ones. The newer ones are responsive, touch to focus is nice, etc. But that comes down to a value/cost proposition that is an individual decision.
Going from the 7D to the 80D, there should be a noticeable improvement in shadow lifting ability at ISO-100.
High ISO ability, though, is not much improved (although 80D files clean very nicely in Lightroom).
I think overall you will notice an improvement in image quality.
But you should definitely consider the difference in build quality and overall feel.
The 80D is a smaller and lighter camera that definitely lacks the 'build like a tank' feeling that you must be accustomed to.
I personally don't think that the 80D feels plasticky but the 'quick control dial' definitely feels cheap.
The top LCD is on the smaller side as well.
So, overall, you will be moving to a smaller camera that won't have the solid feel and heft of the 7D.
I used to have the 40D and even though I was looking to downsize, the size/handling difference took some time to get used to.
But once you get used to the smaller size (and some of the quirks), it's really a great camera.