When my kids were little, I had a big vegetable garden, and one year I put out 100 Roma tomato plants.
I made my own catsup that year. Let me tell you, it is a LOT of work! Back then, I only had the old fashioned cone shaped food mill, and it took a lot of elbow to run through all those tomatoes. It also used a lot of expensive spices. Then there's the cooking process...you have to stand and keep it stirred so it won't scorch, and it "blurp, blurp, blurps" all over the place. I even had catsup on the ceiling when I was done.
The finished product was delicious, but the kids and husband didn't like it because it didn't tasted like "regular catsup".
Now I have a food mill on my Kitchen Aid, which sure would make things easier. If I were going to make catsup again, I think I'd do it in the crock-pot or the oven. I made apple butter in the oven one year, and it turned out great. You still have to stir it, but not as often.
I made chili sauce almost every year. It was very good, and not such a pain in the butt to make.
If you have a lot of tomatoes, you might also try making sweet tomato preserves. I tasted some at a friends house last winter, and it was delicious. It had some citrus and lots of cinnamon and spices. Great on a biscuit!