The short answer is no. I've lived with the same partner for 20 years as of next month (same sex). Although we've been legally able to get "married" in the last couple of years neither of us see any point in it.
We've known too many folks that have lived together for a long time then split up after marrying. Does marriage after a long relationship breed a degree of complacency? I don't know - perhaps someone with experience of that can answer.
I wonder how many people get married because it is expected of them from their family and peers? My view is that it is becoming a commercial money making racket with the victims those who can probably afford it least. The thousands of pounds/euros concerned would be better spent on building a firm financial basis to the relationship.
I would like to finish off by saying that I do have respect for people who do get married. If it works for them then all well and good. My own parents will have been married for 50 years next March. It is just not for me for the reasons I have given above. I was never a person who would conform easily.