I frequently realise that I've been veggie for a few days. Not out of any desire to not eat meat, just that I haven't.
This is much how we roll chez Casa Reynard, and really, it's not something we particularly think about. All that matters is whether the food is a) tasty and b) filling.
But we do eat a lot less meat than we used to. One, I'd much rather have less of a good-quality and high welfare meat and really enjoy it, than have a plate heaped high with the intensively-reared meat. As a cook and foodie, the difference can be quite startling. And two, as has been mentioned upthread, it is in part due to the environmental impact of meat production.
I will make meat go further by putting it into things as opposed to having it as the centrepiece of a meal - current culinary endeavour is a mexican-style spicy chicken, but it's also packed with tomatoes, beans, onions, peppers and sweetcorn. And the vegetables and pulses actually make up the bulk of the dish.
I'll happily eat vegetarian and vegan food, and a lot of it (not, might I add using fake "meat" products) is lovely. Curries, cannelloni stuffed with spinach & ricotta, roast squash, lentil & feta pies, gnocchi alla sorrentina, bubble & squeak with baked beans and a fried egg plonked on top...
When I'm either judging or stewarding at a cat show, I do tend to go for the vegetarian options for lunch. Likewise when I (rarely) go out for a meal.
From where I'm sitting, it's about having a good, interesting and varied diet.
P.S. I love eating fish and seafood too. Anything goes really.