Yeah, the BBC have used 1200mm+ lenses for TV here and there, too. Usually for b-roll. Get up on a tall building, point it down, and you've got some excellent crowd shots without disrupting anything with a crane rig; filler shots for wildlife documentaries, too, though nothing substantial since at that range you're looking at a lot of haze out in the wilderness. The recent Planet Earth II series has some EF 1200mm use.
I think many Canon users would be surprised by which EF lenses actually get used by major production companies. The 1200mm and 800mm get fair use; regular video cameras don't typically have access to that kind of focal length, so if that's what you need you basically have to grab an EF-compatible system. The 500mm f/4 IS is really common; the 600mm kinda gets skipped over. (The Sigma 200-500 on EF mount is also very common.) The 70-200 f/4 IS, anecdotally here in the UK, is used more frequently than the f/2.8 IS. The 17-40mm is a mainstay for the BBC, even though many people here and on other Canon sites will write it off as being the poor man's 16-35. (And, side note: Samyang lenses are quickly taking over.) A lot of the EF lenses sites dedicated to SLR video hype up actually don't see much use in professional production, while a lot of the lenses they wouldn't even think of commenting on—like the 1200mm—actually do see some significant professional use.