No I do not for I do not take public transit.
Some people do have a problem with sitting with their legs completely closed. Saying that, I've never met someone who needed a wide gap between their legs to be comfortable but I honestly don't believe that people intentionally take up large amounts of room that other people are trying to seat themselves in. At least not usually.
I have no problems with sitting with my legs closed, I also have no problems with them crossed or behind my head so I'm not a good metric to consider standard.