I have owned and used Nikon in some form for five decades. I currently have a Nikkormat FT from the 1950s, a chrome unmetered F from the 1960s, an 70s era Apollo FTn, an F2 made later, and an F3HP made later still that I got essentially new in box (and paid way too much for
For pure utility and elegance of simplicity, I don't think anyone ever made a better 35mm SLR than the original F/F2 in their variations (the F2 was really just a better F). I know they are not "modern" in the sense of this thread but these cameras are just bulletproof workhorses that still hold their own 50+ years after original build. I have literally dropped an F from my lap onto a concrete sidewalk as I stood up, forgetting to put the strap on after I reloaded, and the camera just kept working flawlessly.
I'd love to love the F3 more than I do. It's a wonderful "next turn of the crank" from the F/F2 era. The shutter, in particular, is an accurate and highly reliable piece of machinery. But my love for the F3 is tempered with my hate for its meter. That LCD with a backlight button has no place on a pro camera. It's just consumer grade eye candy that's hard to see and harder to use. What's maddening about this is that LEDs were well available during the F3 design cycle. The way Leica handled this in the M6 is waaaaaaay better.
So when I reach for a 35mm SLR, it's almost always and an F or the F2. (The Nikkormat is my cheap "car camera" that works remarkably well 70ish years after being built.) I do use my "modern" F3 from time to time more out of nostalgia than anything, but then the clumsy metering in low light shows up and I got back to one of the other bodies.