Machines more suitable to long term support releases will generally be business machines (such as web-servers in datacentre's or servers in a workplace). These machines it would be generally disruptive to be upgrading the operating system every 6 months as opposed to every 3 years! When it is essential to keep the downtime to a minimum, time is money!
Generally a long term support distribution will have constant security fixes and the like to keep the system stable, but no MAJOR application changes. A lot of the time for a fileserver sitting in an office with no screen won't benefit from that new version of firefox or that extra wallpaper.
In your situation, if you want the latest software, stick to recent ubuntu releases. The fact that you're not a fan of unity doesn't mean you have to use an older version of ubuntu as you are fully aware. When you first get to the login screen after installation, change the drop box at the bottom of the screen to ubuntu classic. This will ensure you've got the latest software, security fixes, efficiency fixes, and a few extra toys to play with that have come out of that extra year's worth of development!
I do find it unimaginably odd that even though you know about that feature you'd rather use an LTS verison. LTS suuport lasts for 3 years on a desktop and 5 years on a server, wheras it's normally 18 months for standard release. This means that both 11.04 will "expire" after ubuntu 12.10 and ubuntu 10.04 LTS will "expire" after ubuntu 13.04 respectively.
So for you, an extra 6 months worth of life on the more "stable" operating system?
Or cutting edge?
Enjoy your Ubuntu!
Here's a link for anyone else reading this showing you how to switch to classic desktop after installation:
Nixie Pixel - Change back to the Classic Gnome look