You're not wrong... we do go to France quite a bit where it is pretty handy to have, but I can easily live without it. I think one thing that irritates me is that my wife's just had a new Seat Ibiza 1.4 with cruise control as standard... Along with folding mirrors and voice control Bluetooth, and yet it cost less than half what the Golf did ;-)
Btw, I did ring another dealer, Solihull VW, who said cruise can not currently be retrofitted due to a technical issue on post 2010 Golfs. He said there was a fix in place, although it was awaiting approval from Germany....
The truth is out there somewhere ;-)