I love over-built folders, but most days a 3.5" slipjoint will handle most of my cutting chores. Growing up in North Carolina, I remember hearing the term "Hell-for Stout". Some of the older folks I knew said they heard their grandfather's saying it, and it meant over-engineered, over-built, and sometimes it wasn't said as a compliment.
All of my overbuilt folding knives have been lockbacks & linerlocks, but I do have two traditional non-locking knives that qualify as "over-built" as well. As far as their uses, most of the time I carried them when hiking or camping, and they served very well in camp duties; the previous owner of the SOG Tomcat was a serviceman, and as I understand it, he used it for years as his EDC for a lot of rough work. I chopped kindling with a Cold Steel Spartan a couple years ago at a Scout camp. The Tarani First Responder opened cans when we forgot our can opener.
SOG Tomcat, one of the first generation models; I think the blade is .200 thick, and the knife is all stainless except for the rubber scales:
Cold Steel Spartan; 4mm thick blade, Triad lock:
Ontario XM1D. With gloves, it's a big, fat, tough handful. I had one, sold it, and just got another one.
Tarani 5.11 First Responder; really thick S30V blade, thick liners, massive handle that allowed several grip positions: (Man I miss this one)
Here's an Ontario Hossom Retribution: .200 thick blade, thick Ti liners, fat G10 handle scales; it's to the left of the Spartan:
~Chris