It's up to everyone to make their own decision for their own reasons, but personally I can't see any reason I would want to change my name, ever. I'm not married, for that matter, but for all practical purposes, and in all the ways that count, we're married, and I call him my husband. (In Norwegian that neatly comes out as "my man", which is quite correct )

Basically I consider marriage a private matter, as private as what I vote, what my religious views are, what my interests are and who my friends are. Not a secret, mind you, but something that I don't feel the need to state publicly by changing my name. I'm me with my name, the man I'm married to is someone else.

Our son carries both our surnames. Mine is the most unusual, so that became his given surname, while my dh's surname became his middle name. To keep things a little simpler we gave him just one first name, a slightly unusual one. I promised dh that I would use our son's full name on all occasions so that dh's surname wouldn't "disappear".

Likewise I have my mother's maiden name as my middle name. I hated it like the plague as a teenager, as a grown-up I suddenly appreciated having both my parents represented in my name and I use both names actively today.