Considering everytime there is some vehicle content (Ulduar, Oculus, etc.) it seems that people have the biggest problems in the world with a) reading their 2-3 new vehicle abilities and b) understanding them and then ofcourse consequently c) being able to use them efficiently.
It's as if people don't understand the 'ability description lingo' and just mash their own class buttons and do as they see others do, copying ability rotations (or priorities) without really understanding why.
And I'm not even talking about 'teh casuals' here and other LFR heroes, but even about some of the hardcore raiders. I remember Flame Leviathan + 3 towers taking ages purely because 75% of the people in the raid needed forever to finally understand how their vehicle abilities worked.