I upgraded from a Note 5 to the Note 8.... The difference is significant.
The RAM boost allows for several more open apps and web pages before there is any lag.
Improved battery performance is also very real, which I would guess can be attributed to the more powerful and efficient CPU.
I was surprised how much more I enjoy the 18.5:9 screen ratio of the Note 8, VS. 16:9 on my old Note 5. I jumped between both phones for a bit, and the Note 5 felt awkward, quickly, when I did... Something I did not expect, as I had no issue with the Note 5...
Having expandable micro USB storage with the Note 8 was also very important for me (I save my music collection /digital subscription directly to micro USB).
Anyways, I'll cut off my praise now, as I risk a rabid fan boy label. I don't need or use a laptop... My Note 8 is my exclusive access to the online world. Thus, in no way was it overkill or unjustifiable.
That said, every consumer is unique. If you don't make heavy or extreme use of a smartphone, then settle for something less expensive, or hold off until the normal price reductions of the Note series pick up momentum the closer the arrival of next years Note 9 comes.
I seriously believe I'll have no interest in upgrading until perhaps the advent of 5G networks. Sure, there will be some incremental improvements... So unless I break my Note 8, I might not be in the market for a new phone until 2022.... Or longer..... Seriously.