I think the main reason the Colts don't get called for it, and other teams do, is the fact that the entire line gets up, with other teams, it mostly one player, thus drawing the false start.
I'm not saying the rule doesn't favor the Colts, because it certainly does. I'm just saying, I think when the official sees only one player do the movement, instead of the entire line, I guess they feel they need to call it.
I actually remember the Skins were called for it a bunch of times when Spurrier coached them. There is nothing they did, that the Colts aren't doing now. It's a head scratcher.