It's because two 2uz-fe blocks have gone 1,000,000 miles (fleet duty Tundras). The first Toyota bought back (or traded
for a new Tundra, depending on the story). Legend is, Toyota tore the block apart and measured everything and it was still to factory tolerances.
I'm a Chevy V8 guy, but the 2uz-fe is arguably the most perfect, flawless V8 ever made. Period.
You do have to feed it timing belts and water pumps, so it's not exactly "cheap" in the long haul, but it won't give you issues either.
As Toyota fans are apt of saying "All it needs is routine maintenance." and it's true. If you'd rather "schedule" your maintenance, rather than have inconvenient breakdowns, it's probably the best engine out of all engines to buy.
What nobody bothers to do, is the math: that Tundra cost $10,625 in timing belts (at $850 a piece every 80k miles)....