Yeah, I have a couple of very inexpensive multi-tools. They've served me well for years and years. I also have a couple of home tool kits.
On the road, I've never had to perform a repair more extensive than a tube replacement or "quick" patch, as you've said. I did dent a wheel once, but it was rideable, and had it "fixed" by a coop shop as best they could. I never did have to replace that wheel, btw.
I'd like to have a more extensive kit for the new road bike. For bragging rights? In case I want to upgrade a crank and bottom bracket? Swap out a cassette? Replace a cable? Or, maybe all of the above. It's kinda ridiculous how useful a $6 multi-tool is, however.
I'm leaning towards the jenson kit as it's the least expensive of the two.