In the case of the Astros, I think they're hitting Jose Altuve 2nd. He's what you would consider a "prototypical" leadoff hitter (career batting average well over .300 and averages over 30 SBs per year). Joe Maddon likes having a "leadoff at the bottom" kind of lineup, so he's used guys that could hit leadoff in the 9 hole and hit the pitcher 8th fairly frequently the last 3 years in Chicago.
I would guess that most teams are hitting them at the bottom of the order somewhere. Speed isn't really utilized offensively in a traditional sense. Stolen bases are way down, and bunting is nearly non-existent.