If you get a jeep made since 1995, it's definitely way more complex. The jeep in the video doesn't have the same emission controls and safety requirements of a modern vehicle.
Modern jeeps still shars some of the same design principles. For instance, tub on frame -- they lift the tub off of the frame. The cabin of a jeep is like a bathtub on a wagon.
The suspension in modern jeeps is far more complex in order to give a smoother ride -- the jeep in the video has leaf springs on front and back. Modern jeeps typically don't have leafs in the front.
Jeep CJ's were the first consumer models available. Some of the older ones may be close to that simple.
I drive a jeep. I think it's awesome. For the same reasons I like it, most of my passengers hate it:
- it's loud (soft top or top down you basically have to yell to hear each other, forget listening to the stereo on road trips) - it rides rough -- you get thrown around - it has almost no features. I have a heater, headlights, three speed wipers (off, too slow and too fast), manual windows/mirrors and a button to reset the trip counter
Also, it's a bit of a money pit. It's super rugged, but when you take it into the bush, you push the machine to its limits. I'm not really an expert in vehicle repairs (spent my teen years on computers instead of with my dad in the garage), but I'm definitely getting more into it as a way to save money.
I get about 15 L/100KM (~15mpg). It's as aerodynamic as a brick flying sideways, so you can't really do anything to improve gas mileage.
That all being said, I love my jeep. I can't see myself not owning a jeep in the future.