Honestly, I think this really depends on your hardware.
I have a 2011 MacBook Pro 13". I almost entirely run it in what used to be called "desktop replacement mode".
Connected to it is an Ultra USB hub with port reader, a set of Logitech USB speakers, a Logitech keyboard and mouse (both wired), and an HP LaserJet P1102W.
Everything works seamlessly out of box except for wireless (there's full support for it, but LM never has and seemingly never will include those drivers), and my printer requires an additional software component downloaded directly from HP's servers.
There is, for me, absolutely not a single way in which 18.x or earlier is better than 19. Like you, 19 is snappier and smoother. For me, my system fans very rarely are sped up, and that's only during what I know are heavy load events.
As I said, experience will vary depending on the box in question.
Peoples of the universe, please attend carefully: the message which follows is vital to the future of you all.
Presently rocking Linux Mint 19.1 Cinnamon.
Remember to mark your fixed problem [SOLVED].