A majority? OK, if we count every single game that has RT, sure. I am fulym aware many have such insignificant effects, that it's not worth enabling. Again, big divide in games with RT and what's good or not, but when it's good, it can be really good, like the next point...
Same (experience wise in games) perhaps identical or even more so, and my takeaway is the opposite of side grades, I'd say transformative, realistic, immersive. Here the thing that works against the effects is realism, I've surely said it before, but some effects, like global illumination or sun shadows for example, appears so natural the untrained eye night not even notice how excellent the behind the scenes stuff is to enable it, as it just seems so normal.
Personal opinion appears to reign king. I can't convince you certain PT or even RT titles are amazing graphically, nor could you convince me they're not.
"extra" (unused /unallocated) vram helps, no doubt, more calculations and overhead needs memory.