This might be a UK thing but no, not keen.
I don't like cold butter so that rules the sandwiches out, I don't like quiche with onion in and so many people do that, I can't risk it. I'm not a fan of cold cheese and I always try to avoid going up early in case anyone thinks I'm a fat pig! By the time I get up there all the best bits have been taken. Vol au vents are pot luck too.
Going out to a restaurant type buffet might be slightly better but I always think the food is just warm not hot and I have to question the safety/hygiene of leaving food out in a bain marie for that long.
A carvery buffet on the other hand is excellent.