It's time intensive, that's for sure. Getting all that water to boil in my big canning pot was a pain! I used my dishwasher to sterilize the jars & rings and the applesauce kept for a while (my grandma didn't eat it for a few months and it was fine), so I think that was okay. I would have had to prep yet another pot of water to sterilize them and keep them warm before filling & processing and I don't have enough pots/stove-top space!
Tomato sauce sounds fun. I might look into that if my parents get a good haul of tomatoes this year. I don't think I'll do that much, it's a lot of work, but some jars for gifts around the holidays would be nice.