I feel the same way about my 2007 IMac. Still runs like a champ. Never could have gotten this much use out of a PC.
Same here with my 2009 Mac Pro (8-Core 3.46GHz,32GB), 2011 17” MacBook Pro, 2012 13” MacBook Pro and 2012 Mac Mini. Everything is updated to 10.11 El Capitan and running with no errors.
You couldn’t get me to switch to Windoze if you offered me $3000 per machine.
(Well, maybe, but I’d probably switch back)