Think it just comes down to personal choice. Been divorced 8 years now and still use married surname as my children also have that.
Personally I just like the 3 of us having the same "family" name rather than thinking of it as "his " name.
I have wondered what I would do if I were to marry again because we all like it that we are the same name.
I never liked my maden name anyhow so I didnt want to go back to that, but I do dislike the term Ms so I still go as Mrs.
I had my Maiden Name for 19 years, but my married one for 27, so had to weigh up the plus and minuses!
Pluses: 1)Son has same name, 2) my car registration connected to married name, would cost me to change it, 3)house name is linked to it, and nice plaque on the house outside, cost me to change it 4)probably annoys someone out there that I've never changed it, 5)has a nice ring to it! 6)its unusual, only 3 of us in this town!
I think it's quite common to revert to your Maiden Name and it's one way of telling the world that you have divorced without actually having to say so, which might avoid some otherwise uncomfortable situations.
I never took my husband's name in the first place, so I have avoided this issue. It means that the children and I have never shared a name. It generally only matters regarding schools (I just say I am X's mum when I phone them) and when my children's friends try to look us up in the phone book.