LTS releases also don't offer upgrades to non-LTS versions unless you explicitly enable that via the "Software & Updates" tool.
It was also a revelation to me - easiest install ever. Prior to that I was running some version of Mandrake (and prior to that, Woody).
I've been running Linux in some form or another since around 1995; I started with Turbo Linux 2.0 (ok, ok - my first Linux was Monkey Linux over DOS, but it was more a plaything). I'm not unfamiliar with the intricacies of installing Linux (and I've compiled my own kernel before just to get certain things working - did that for a 486 laptop just to get everything on it working - sound, modem, PCMCIA, ethernet card, video, etc).
Being able to just "point and click" - while Mandrake allowed it, and SuSe also to an extent - it wasn't anywhere near as clean as what Ubuntu allowed for. I've pretty much stuck with Ubuntu since then (though not with their wm/desktop - blech at times).