It is debatable whether or not that truck was even worth $60k to begin with. The added cost of the diesel aside, many of those trucks can be had in base form for around $30-$40k. The extra $15k-$20k has a lot to do with all the luxury items and gadgets that many truck owners now expect to have. And it's those fully loaded trucks that often see massive depreciation hits in their first 4-5 years of ownership.
It's not like a 3/4 ton, like the F250, has better offroad prowess than something like the 4runner. Given its size and weight, it likely isn't. The extra money you pay for a 3/4 ton is due to the extra towing/payload capabilities, more powerful engine options, and, depending on the trim level, greater luxury features. So in essence, the F250 is also just your standard pickup, it's just that some versions come fully loaded with diesel engines and luxury features, which drives up the price.
And as someone else has pointed out, the 4runner is very unique due to its BOF construction and offroad prowess. Most so-called "SUV's" are nothing more than unibody passenger car platforms that have a mild lift and no where close to the offroad capabilities that a 4runner has. The 4runner's interior and comfort is mediocre compared to other brands, but it is more than adequate for long trips. And unlike other brands or SUV's, like Land Rover and Toyota's own LC 200, the base interiors keep the price down, which makes the vehicle more accessible to the average buyer, which in turn allows for more of them to be sold. So in that regard, I'm very glad Toyota has decided to keep the 4runner simple and spartan. I'd like to see more innovation in the engine department, but that aside, I think Toyota has hit a homerun with the 4runner, and the sales numbers prove it.
I think my non-kdss TRDOP rides pretty nice on the highway. My last two cars were an Infiniti and a Lexus. My brother in law has a Sierra Denali with magnetic ride and even he says my car rides great on the highway. Coming from two luxury cars, there's something about the simplicity of the 4Runner that makes me enjoy it more. Luckily my wife drives a manual transmission BMW so we get both ends of the spectrum for luxury/performance.