When I'm at my boyfriend's we do. His family are very much dinner time is family time. In my family, because my parents are divorced, we never really have. My dad uses the dining room table as extra storage or the dumping spot where random letters, objects etc. get piled on. At my mum's, the house is so small and she has so much stuff that the dining room table is also another storage area. At uni, I eat at my desk in my room because my flatmate doesn't clean up his mess, spilling sticky drinks and not cleaning up crumbs / grated cheese. I refuse to clean it so I don't use the table.
At Christmas / special occasions, the dining room tables are cleared. Quickly goes back to being how it was though. I think if my parents were still married it would have been more frequent to eat at the table.