I don't think so. The phone seems fast to me, and the new UI is nice.
Disclaimer: I don't compare the speed of opening 14 apps, closing, and reopening them to other phones (I don't even do this in my normal usage). Of course, I don't do this with any device. The macbook pro in my house is a great laptop, if a bit slower than my surfacebook. I enjoy them both, but if I compare them to my desktop, they are downright pathetic speed wise. But I don't, all my devices seem fast enough for my use.
Maybe I am getting old, but I find this repetitive discussion we have every year, with every phone launch to be tiring. These are expensive devices. Did you really just pay this much, so that you can stress out about it on an online forum? Alternatively, did you really just go from enjoying your new purchase, to returning it because of a youtube video?
This is the discussion around the note 7. The iPhone 6 was filled with people on this forum babying their phone, so that it doesn't bend. The iPhone 6s plus had camera disappointments, didn't it?
The iPhone 7 will be a disappointment based on stale design, non-oled display (that is a personal thing), dual camera may disappoint, probably still 2 gigs of ram, and the price will be hard to swallow. I almost guarantee one or more these issues will dominate the iPhone forum in about a month.
Personally, I love my note 7. I will keep it for a good while, unless the iPhone 7 or the Nexus 2016 tempt me away. They will have to bring a lot to the table, but we will see.
***Also, I imagine the note 7 needs a few bug fixes and optimization via updates. This is no different than what we see with new iPhones and Nexus devices.***
****One more thing, go visit the iPhone section. You will see what I mean, there is nothing but complaints, along with already perceived disappointment with the upcoming model. These forums are a small sample size, and you are more likely to here the vocal minority.***