I'll second that bigtime. Just like toilets, people treat disposals like they are a magic way to make stuff go away. If people would scrape the plates and cooking pots over the trash first, their disposals would last a whole lot longer. So what if you have to empty the kitchen trash more often because SWMBO says it stinks? Better that than replacing the disposal every couple of years. If you have a garden, most of what you put down disposal should be going in compost pile anyway.
I had a disposal growing up and in first 3 apartments after being out on my own. Only time they ever jammed is when I stupidly put something small and metal near sink, and it jumped in there. (a corollary of Murphy.) Bought this place almost 6 years ago- no disposal. Adding one was on my to-do list, but hesitated because I was on septic. I don't even miss it any more, and at this point, will let next owner worry about it.