They do get used quite a bit. Mine is the 48" version, but I've never had to use the entire bar.
For situations where you need to remove a tire on the trail a bottle or floor jack can be easier to use, but if you carry a ratchet strap to strap the axle then the hi-lift works just as well; and it's more flexible for other situations. And the handle makes a good breaker bar (they used mine at Gulches to help fix Clark's breakage).