Ah, good times. I don't know yet how many tomato plants I'm going to have. If I had to guess, I think I've probably got.... at least 200 or so baby tomato plants in the pantry. Still need to thin even more and transplant them into their own parts. Of course, I do have my yard and my neighbor's yard I'm planting, but still.
Last year I had what, like 76 tomato plants out back? In my approx 10'x20' freshly tilled-last-year garden. In 15 different varieties. Brandywine and Ananas Noire were a bust, Black Krim isn't as prolific as I need, and Speckled Roman was eh. Determinate ones seem to do a bit better for me in my little zone 5 yard. Like Alaskan Fancy, Cougar Red, Amish Paste did okay, Kootenai always kicks butt for me in it's own tiny/petite way, and indeterminate Purple Russian... man, I'm still impressed with last year's performance, despite the challenges. I definitely needed more tomatoes/plants. And less of that crazy rain last year - that made things sucky. Hence why I'm going bonkers again this year.
And not to be an enabler (hah, who am I kidding), but you can simmer down tomato sauce without having to be in front of it for hours to keep it from burning...
Just haul out your crockpot(s), squish up your tomatoes (I
my Squeezo), throw in the crockpot. Turn on high for about an hour to get it bubbling and stir it occasionally during that, then on low overnight. Just stick a chopstick under the lid to vent it so the liquid can evaporate. Leaving the lid partially on means less mess if you do manage to get bubbles exploding that you're not cleaning the ceiling or microwave back. Just make sure to perpetually stir the sauce in the crockpot even when it's on low, and you're golden. Less fuss all around, which I'm quite a fan of.
ETA: The 10'x20' was just tomatoes and a few peppers and some basil, my garden's a little bigger than just that.