Yes, 90% of the time we, or at least the kids, are sitting at the kitchen table.
On occasion we spread out some towels or a blanket and have a "picnic" while we watch something special together at dinner. And on kids birthdays they're allowed to have whatever they want for dinner, and as my oldest has figured out that means ANYTHING, and if he's careful with his selection he can usually get us to agree to a picnic.
Anyway, I do it because there are too many crumbs as it is, and we all know crumbs get tracked. I can't have that happening all over all the time. And spills happen...no matter where they're sitting. And a few years ago, when we stopped using an exterminator monthly we had a small roach issue. Small, because we were able to stop it quickly, but big ick factor for me, and I had a hard time sleeping. I washed everything before I put food anywhere near it etc. I'd really rather not repeat that, and keeping the food to one area is helpful.
They do call us out a lot on eating in the living room, because we do it a lot more than we should.