As a 2080ti user I have to admit that I barely use any features from Nvidia. I have a Gsync 240Hz monitor but guess what - Gsync introduces grey scanlines and is useless because I always have more than 100fps, in my favourite shooters more than 240. Tried DLSS and hated it. While it looked good while standing, with heavy movement it looked like really smeary bad anti aliasing. This might be different when you play in 4k though, as you have much higher ppi. Well, not important to me anyways. Framerate > graphical fidelity at any day. But for 4k players DLSS might be a good deal.
Shadowplay is buggy as hell for me, even after all these years. You did some nice frags? Nice, gonna hit ALT+F10 --> oh shit, it was turned off, even though I started it manually when I started the game. I mean when it works it works but I have missed so many great clips because of that buggy ass software.
I never turned on RT as framerate is much more important to me. But it might be nice in a few years from now.