No, it gained widespread USE in 3e, but it existed before. I have 7+ years of playing a thief in a group dominated by wizard and wizard-hybrids to show for that. Don't underestimate the ability of a couple of M-U's getting together to coordinate their spells-per-day to make the fighter and thief seem like XP sponges rather than contributing members.
My theory on this is that levels beyond 10 went from pretty much unplayable in 1e/2e to merely tedius to DM and sometimes complicated to play (especially for prepared-spell casters) in 3.x, so mid to high-level play became a lot more common in the 3.x era.