Even if useless on the big hits, cheap suspension mods have a tendency to help cancel out the high frequency "noise" being fed into your hands, wrists, and butt. Maybe the younguns don't notice this as much as the older folks, but this old fart really appreciates any help he can get on longer rides.....
Regarding going up a curb, I usually yank the front of the bike up, lifting the front tire as we go over, then lean forward to lesson the shock on the rear. I doubt I could bring myself to just run into one of the curbs we have around here. IF the bike wasn't stopped dead in it's tracks, that's still one heck of a lot of stress to be absorbed. Abusive is the word that comes to mind there.
Point being, on Rad's cheap front fork, my riding style would always prefer something like that over a solid fork. There was a day when I would spend the money for a quality fork (air adjust), but I haven't really been able to justify the expense yet. That's me though, FWIW. -Al