What’s insane about it? You eat food and your waste goes to the sewer. The garbage disposal does the same just without it passing through you. Also they’re only really used for scraps (egg shells, vegetable peels/trimmings, bits from rinsing dishes, etc) it isn’t like you’re dumping a whole plate of spaghetti down your sink. If you don’t have room for composting then the only alternative is throwing that stuff in the trash.
If your pipes are getting gummed up from it then you aren’t using it often enough or using enough water when you do use it. I do all my own plumbing and I’ve used mine for 6 years now without any issue. Hell, I think that sink is the only sink in my house that has never clogged.