I don't really do anything that requires Large Format. I rarely enlarge beyond 8x10 and rarely use movements. Probably 90% of the 4x5 negatives I have were shot hand held with a Crown Graphic and enlarged to 5x7 or 8x10 at the largest. I also shoot 35mm SLR and again, rarely ever enlarge to bigger than 5x7. And while I agree that a decent 8x10 (or 8x12) print can be made from a carefully made 35mm negative, I can definitely see a very noticeable difference between an 8x10 from a 35mm negative and an 8x10 from a 4x5 negative. There is also a very, very noticeable difference between an 8x10 enlarged from 4x5 and an 8x10 contact print. I'll also add that it is much, much easier for me, with my meager darkroom skills to coax a decent 8x10 print from a 4x5 than it is from a 35mm negative. I also shoot some 6x9 & 6x7 and you're correct, the difference between these Medium formats and 4x5 is small but, again, the experience is different.
So, I guess I don't do anything that really requires LF but, I do prefer it. Interestingly, the 4x5 Crown Graphic isn't much more of a burden to carry or use than an RB67...and so, I choose the Crown.
Finally, once you've seen a 4x5 color slide on the light table...you'll never wonder why someone would bother with LF again.